Remove Pods from repository

This has caused multiple problems with AppCode breaking the Pods. At least I will no
longer distribute my broken Pods around.
MXIAppDelegate: Insert pragma marks and sort code accordingly.
Create MXIChatWindowController and move most of MXIAppDelegate there.
Miliseconds are 10^(-3) seconds, microseconds are 10^(-6).
Change font to Helvetica Neue Light.
Prevent showing <null> for servermessages that don't have a nick.
Rework parts of the heartbeat code and store eid on BufferEvents.
Fix declaration of didReceiveBufferEvent.
Make font-weight of notices the same as normal messages, just italic.
Make nick-completion case-insensitive and fix a bug where it wouldn't complete after the fullname has been typed.
Merge pull request #11 from nezza/master

Seperate the chat-window logic from the application delegate
Add support for quit events
Add missing NSTextFieldDelegate protocol to MXIChatWindowController
Rename everything to Rainchat
Use Objective C gitignore from GitHub

This also adds Pods again, since CocoaPods actually recommends keeping them in the repo:
http://guides.cocoapods.org/using/using-cocoapods.html#should-i-ignore-the-pods-directory-in-source-control
Update Mantle to 1.5

Remove properties that do not exist from JSON key mapping because that is
an error in Mantle 1.5
Remove old workspace
Rename eid property to eventId
Change all fonts to Helvetica Neue Regular
Move event handlers into event classes

Thanks to @Zaba and @nezza for feedback