examples: Added IMAP DELETE example

examples: Added IMAP CREATE example

examples: Added IMAP SEARCH example

examples: Added IMAP EXAMINE mailbox folder example

examples: Added IMAP APPEND example

examples: Added IMAP STORE example

examples: Added IMAP LIST mailbox example

examples: Rename before adding additional email examples

examples: Added SMTP EXPN command example

sessioninfo.c: Added sample code for CURLINFO_TLS_SESSION

Added a simple example to show how one can use CURLINFO_TLS_SESSION for
obtaining extensive TLS certificate information.

postinmemory: new example

This is similar to getinmemory.c but with an initial POST.

Combined-by: Ulf Samuelsson

examples: Moved usercertinmem.c to COMPLICATED_EXAMPLES

This prevents it from being built during a "make check" since it
depends on OpenSSL.

tarball: include the xmlstream example

usercertinmem.c: add example showing user cert in memory

Relies on CURLOPT_SSL_CTX_FUNCTION, which is OpenSSL specific

Added libuv example multi-uv.c

htmltitle: use .cpp extension for C++ examples

examples: Added a c++ example of using multi with boost::asio

Added an example for demonstrating the usage of curl multi interface
with boost::asio in c++

href_extractor: example code extracting href elements

It does so in a streaming manner using the "Streaming HTML parser".

ftpsget: simple example showing a FTPS fetch

sftpget: example showing a simple SFTP download

... using SSH-agent

url2file: new simple example

Just showing how to download the contents of a given URL into a local
file.

Based on a suggestion and example code by Georg Potthast

imap.c: a dead simple imap example

Just to show that IMAP is used just like other protocols

examples: update README, Makefile.inc and gitignore with pop3s examples

progressfunc: a simple CURLOPT_PROGRESSFUNCTION example

resolve.c: new example showing off CURLOPT_RESOLVE