Converted replies from custom comments to custom posts

Also changed the usage of word comment/comments with reply/replies
Using variables to store imap/smtp ssl preference
Prefixing table elements with 'table_' to avoid mutiple elements with same ID
Set account data to null instead of removing it to maintain unique account ID
Corrected IMAP_INVALID_CREDENTIALS constant spelling
Using get_the_date/get_the_time instead of mysql2date/mysql2time
Merge pull request #87 from VarunAgw/settings-page

Created a page to add/remove IMAP E-Mail accounts
Using WP_Query class to get replies count instead of querying db directly
Setting `supports` as false instead of an empty array to make code look better
Identifying 'Delete" link by class rather than ID as they can be more than one
Merge pull request #92 from VarunAgw/settings-page

Bug Fix: Identifying 'Delete" link by class rather than ID as they can be more than one
Merge pull request #90 from VarunAgw/post-table

Converted replies from being stored as comments to being stored as `sf_thread` posts.
Setup wp-cron to retrieve E-Mail replies from IMAP server
Add comma automatically after e-mail ID to save user time
Prevent suggesting E-Mail ID's that are already entered
Improved SupportFlow_Emails->mail method to support cc and bcc
Using headers instead of hook to set E-Mail 'from' ID
Improved E-Mail retrieval code, fixed bugs
Updated plupload to newer version and finished frontend part
Created function to generate an array from multiple comma seperated E-Mail ID's
Added meta box to set cc and bcc receviers of reply
Attachments are now save as custom post in database