Version 0.6.3

update to ecto 1.0.0, release v0.6.2

update to ecto 0.16.0, release v0.6.1

update ecto_migrate to ecto v0.15.0, release v0.6.0

update to ecto 0.14.0, release v0.5.0

update .travis to lightweight containers, and new erlang/elixir

update to ecto 0.12.0, remove upgrade path to a new table size, relea…

…se 0.4.0

update to ecto 0.12.0, remove upgrade path to a new table size, relea…

…se 0.4.0

add possiblity to define extra sources for the model

release v0.3.2

* use more space for meta information
* run migration before update of meta information