Update composer.json
have newNestedSetQuery use qualified order column

Joining a nested set query against another table with a column named the same as the order column (i.e. `name`) will cause an ambiguous column name SQL error. Using the qualified column name seems to address this.
Sort hierarchy tree by $orderColumn
Merge branch 'patch-1' of https://github.com/GrahamCampbell/baum into GrahamCampbell-patch-1
Merge branch 'GrahamCampbell-patch-1' into develop

Target Laravel stable version in composer.json. Merges #67
Merge branch 'patch-2' of https://github.com/ceejayoz/baum into ceejayoz-patch-2
Modify test cases. Expect qualified column name.
Merge branch 'ceejayoz-patch-2' into develop
Implement 'makeFirstChildOf', 'makeLastChildOf' wrappers. Implements #77
Update README.md
Add tests for non-numeric keys use-case.
Merge branch 'makechild-helpers' into develop
Test cases for Ordered Scoped Trees.
Implement depth limiting for queries. Implements/Fixes #62.

Adds a new 'limitDepth' chainable query scope and the depth limit may be supplied as the first argument into the 'getDescendants' and 'getDescendantsAndSelf' methods.
Cleaned up migration stub
Merge branch 'patch-1' of https://github.com/BeingTomGreen/baum into BeingTomGreen-patch-1
Merge branch 'BeingTomGreen-patch-1' into develop
Implement seeding/mass-assignment. [#68].
Merge branch 'mass-assignment' into develop
Update CHANGELOG.