Merge pull request #41 from halftan/master

Added installation instruction for users who use pathogen plugin
Merge pull request #42 from halftan/master

Update README, correct the installation destination by pathogen.
Improve <CR> mapping compatible. #43
Wrap old CR in buffer level.
Fix #44, compatible with old vim before 7.3.
Update map expr checking.
Fix incorrect is_expr.
Correct version check for maparg ext, introducetd from Vim 7.3.32, #44.
Fix #46, Incompatible CR mapping with supertab.
Bump version to 1.3.1