add badge to readme
Merge pull request #41 from sciunto/badge

add badge to readme :  coveralls
Fix variable names

Make the variable for handling files consistent and fix the
examples for customizations 2 and 3.
Merge pull request #46 from gpoo/patch-1

Fix variable names
MAINT, change standard for entrytypes and id
add note about API breakage
DOC: difference upper lower case
Merge pull request #53 from sciunto/type

MAINT, change standard for entrytypes and id