updated action on triple quote to add second line

changed the action on triple quote to add a closing quote and
start editing on the newly opened line inside the quotes.  the
only way to jump beyond the quotes is to escape and scroll down.
this is because a <CR> should give a new line, not jump to closing
quotes.
Delete duplicated pairs in one time.

eg ```|``` {{|}} [[|]]
Update README.
Bump version to 1.3.0
fixes #33: character '|' map failed.
fixes #35: Fast Wrap incorrect.

(|)p[i] to (p[)i]
should be (p[i])
Improve #36, Keep quotes number is odd in one line.
Improve #37, ignore comment line for vim file.
Update README.
Fixes #39, Backspace removes additional " (quote) on line below.
Add License MIT #40
installation instruction for pathogen users

Signed-off-by: HalFtaN <half.a.tan@gmail.com>
Merge pull request #41 from halftan/master

Added installation instruction for users who use pathogen plugin
amend last commit

Signed-off-by: HalFtaN <half.a.tan@gmail.com>
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.