Updated README doc section with AppCode Support

See #230 for more details
fix typo in header comments
Merge pull request #231 from almassapargali/typo-fix

fix typo in header comments
DDLog: calling atexit_b in CLI applications, that use Foundation framework.

Related to #63, #184. Fixes #233.
Merge pull request #234 from dvor/ddlog-fixing-bug-in-cli-with-foundation

DDLog: calling atexit_b in CLI applications, that use Foundation framework.
DDTTYLogger: Favour XcodeColors environment variable
Allow prevention of log file reuse. This is nice if you want to create a new log file at every app launch.
Modification keeps backwards compatibility with existing code as it will maintain previous behavior if the reuseExistingLogFile property isn’t set.
Merge pull request #237 from irrationalfab/fix-terminal-detection

DDTTYLogger: Favour XcodeColors environment variable
Invert logic as suggested by rivera-ernesto
Removed Bitdeli from Readme.md

it no longer can give accurate stats since "Service disruption: GitHub has recently changed the way images are served in readmes. This has seriously limited our traffic analytics features for repositories."
Removing useExistingLogFile as it is now redundant
Merge pull request #238 from Diarrhio/master

Allow prevention of log file reuse.
Update DDASLLogger.m
Merge pull request #240 from yonglam/master

Update DDASLLogger.m
Merge remote-tracking branch 'CocoaLumberjack/master'

* CocoaLumberjack/master:
  Update DDASLLogger.m
  Removing useExistingLogFile as it is now redundant
  Removed Bitdeli from Readme.md
  Invert logic as suggested by rivera-ernesto
  Allow prevention of log file reuse. This is nice if you want to create a new log file at every app launch. Modification keeps backwards compatibility with existing code as it will maintain previous behavior if the reuseExistingLogFile property isn’t set.
  DDTTYLogger: Favour XcodeColors environment variable
  DDLog: calling atexit_b in CLI applications, that use Foundation framework.
  fix typo in header comments
  Updated README doc section with AppCode Support