do not care about the version of rubygems (issue #649)
bump version to 2.0.1
forgot to commit the Gemfile.lock
forget to add the migrations in the gem (issue #651)
fix issue #652
fix issue #641
fix issue #652 (Need to specify order explicitly)
fix issue #656
better exception handling mechanism for the API
typo: 500 instead of 505
Merge pull request #657 from dimonzozo/v2.0.x

fix issue #652 (Need to specify order explicitly), #656
write a small test to confirm the fix #656
bump version to 2.0.2
fix issue #658
fix issue #662
check if the engine still works from a fresh install + fix issue #659
bump version to 2.0.3
we do not need to run the migrations when installing for the first time
new version of haml
merge the branch 2.0.x into master + implement session management in liquid + improve performance in development when testing the embedded dummy app