Merge branch 'release/0.6.1' into devel
Added socket.io-externs into build task
Merge branch 'master' after changes for heroku deployment
Added app externs file and its using at `build` task
Fixed `non-existing data dir` error
Added simple mechanism for spacing out tables when reengineering data
Added `development` view, actual view changed to be `production` view
Added changing of actual model name, added `mkdirp` mock
Added cardinality and modality graphic and defaults relation model values
Merge branch 'devel' of https://github.com/horaklukas/modeler into devel
Added unary relation graphic representation and fix of using env.MODE
Added missing cardinality marker, added setting cardinality into RelationDialog

Added "oneExactlyEnd" marker template. Added setting cardinality (and
modality) at relation dialog.
Fixed layout of cardinality/modality settings at relationDialog
Added supporting of relationship name, changeable by user
Fixed canvas resizing to be recognized by table dragger
Added Postgresql generator, fixed using of right generator

Postgresql generator ingerits from Sql generator. When generating of
sql requested, generator by selected database type is used. Renamed
general generator file.
Added parameter `length` for table columns
Added canvas contextmenu and option for remove table/relation
Fixed reverse engineering, added `start-devel` npm script

Fixed model reengineering by add correct ordering of relations data.
Added updating of child columns when parent column change

Relation columns of child table now reacts on change of parent table
columns.