Fix to initialize $http_header
Fix descriptions of some variables

Declared $http_header and added its description.
And, fixed the desctiption of $http_info.
Merge branch 'fixVariables' into myMaster
Merge branch 'myMaster' of https://github.com/okumin/twitteroauth into okumin-myMaster

* 'myMaster' of https://github.com/okumin/twitteroauth:
  Fix descriptions of some variables
  Fix to initialize $http_header

Conflicts:
	twitteroauth/twitteroauth.php
Merge pull request #8 from natefanaro/okumin-myMaster

Initialize http_header