vauth: Moved Curl_sasl_build_spn() to create the initial vauth source files

URLs: change all http:// URLs to https://

vtls: added support for mbedTLS

closes #496

bundles: merged into conncache.c

All the existing Curl_bundle* functions were only ever used from within
the conncache.c file, so I moved them over and made them static (and
removed

bundles: merged into conncache.c

All the existing Curl_bundle* functions were only ever used from within
the conncache.c file, so I moved them over and made them static (and
removed the Curl_ prefix).

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mprintf.h: remove #ifdef CURLDEBUG

... and as a consequence, introduce curl_printf.h with that re-define
magic instead and make all libcurl code use that instead.

By request, change the name of "curl_darwinssl.[ch]" to "darwinssl.[ch]"

schannel: Removed curl_ prefix from source files

Removed the curl_ prefix from the schannel source files as discussed
with Marc and Daniel at FOSDEM.

des: Added Curl_des_set_odd_parity()

Added Curl_des_set_odd_parity() for use when cryptography engines
don't include this functionality.

endian: Fixed Linux compilation issues

Having files named endian.[c|h] seemed to cause issues under Linux so
renamed them both to have the curl_ prefix in the filenames.

endian: Introduced endian module

To allow the little endian functions, currently used in two of the NTLM
source files, to be used by other modules such as the SMB module.

Makefile.inc: Updated file formatting

Aligned continuation character and used space as the separator
character as per other makefile files.

sasl_gssapi: Introduced GSS-API based SASL module

Added the initial version of curl_sasl_gssapi.c and updated the project
files in preparation for adding GSS-API based Kerberos V5 suppor

sasl_gssapi: Introduced GSS-API based SASL module

Added the initial version of curl_sasl_gssapi.c and updated the project
files in preparation for adding GSS-API based Kerberos V5 support.

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smb: Added initial source files for SMB

Added the initial source files and updated the relevant project files in
order to support SMB/CIFS.

vtls: remove QsoSSL

build: Slight rename of new LIB_* makefile file variables

In order to try and be consistent between curl and libcurl renamed the
recently introduced LIB_* makefile file variables.

Makefile.inc: Added resource file to assist Visual Studio project generation

Makefile.inc: Separated the lib and lib/vtls source file variables

To cater for the automatic generation of the new Visual Studio project
files, moved the lib file list into a separated

Makefile.inc: Separated the lib and lib/vtls source file variables

To cater for the automatic generation of the new Visual Studio project
files, moved the lib file list into a separated variable so that lib
and lib/vtls can be referenced independently.

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sasl: Renamed SSPI module following short name clash

sasl: Added initial stub functions for SSPI DIGEST-MD support

Makefile.inc: use standard source header

Makefile.inc: specify the vtls sources+headers separately

vtls: renamed sslgen.[ch] to vtls.[ch]

openssl: renamed backend files to openssl.[ch]

vtls: moved all TLS/SSL source and header files into subdir

vtls: created subdir, moved sslgen.[ch] there, updated all include lines