Add -snoc
Merge pull request #55 from Fuco1/snoc

Add -snoc
Add replace/update/remove functions for index/indices
Merge pull request #54 from Fuco1/index/modify

Add remove/modify functions for index/indices)
Release 2.4.0
Correct anchors for links starting with '!'
Merge pull request #57 from Silex/master

Correct anchors for links starting with '!'