Merge pull request #66 from syngan/master

fixed document
- Fixed vimproc#get_command_name().
- Fixed error.
fixed s:read_lines()
fixed s:read_lines()
- Fixed vimproc#readdir().
Merge pull request #69 from syngan/sg-readline

vimproc#read_line の結果がおかしい
- Fixed variables parser.
fixed s:read_lines()
fixed s:read_lines()
- Fixed variables parser.
fixed s:parse_equal(script).
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Merge pull request #68 from rbtnn/fix_equal

' =ls 'の後に続く文字列がおかしい。
- Fixed vimproc#readdir().
- Fixed vimproc#readdir().
- Improved vimproc#readdir().