Added keep-alive connection to SMTP. Fixed socket read/write timeouts. Added PHP useragent
Fixed form helper variable error

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>
Merge pull request #2257 from appleboy/helper

Fixed form helper variable error
Fixed tab-indentation. Made appropriate entries in changelog
Clean up
Fixed curly braces. Removed redundant method set_useragent()
Styleguide fixes
removed PR from the bug list
Removed the unused $force paramter in Email::_smtp_connect()
removed a stray tab
Merge pull request #2256 from nisheeth-barthwal/develop

Added keep-alive connection to SMTP. Fixed socket read/write timeouts. Added PHP useragent.