postgres schema
fixed phunit configs
Added signed variable to mysql table
removed stray semicolon
corrected testAddStringColumnWithSiqngedEqualsFalse test
restructured tests so expected & actual are the correct way around
Added information about PDOs
Update migrations.rst
install improvements
Fix typo in configuration.rst

devlopment -> development
Merge pull request #189 from 3onyc/patch-1

Fix typo in configuration.rst devlopment -> development
Merge branch '0.3.x-dev'
Merge branch '0.3.x-dev'
Merge branch '0.3.x-dev'
Update migrations.rst

Fix FK misplaced addForeignKey line
Add sample to set "On delete" and "On change" actions
Merge pull request #199 from fabienhespul/patch-1

Update migrations.rst
spaces and grammar
use `empty` to check $options['port']

i want use the `port: %%PHINX_DBPORT%%`, but other people maybe like the default port,
so just given a empty port config.
Adds tests for JSON format config files.
Adds support for JSON config files.