* Adding group layer support

* Added test case and fixed parsing code

* Adding comma

* Adding missing newline

* Merging GID changes

* Merging GID changes

* Cleaning files

* Cleaning files

* Cleaning files

* Fix #148

* Close #85

* Close #149

* Fix just one small issue

* Update changelog

Fixes #72

Closes #99. ldtk seems to output tiled files with no newlines in the csv
data. Tiled itself does always seem to put the newlines in however, it
can open the ldtk files so we should too.

Also add test for parsed image layers.
The test can be also used as an example off how one can get data from
the parsed map.