Added signed variable to mysql table
removed stray semicolon
corrected testAddStringColumnWithSiqngedEqualsFalse test
restructured tests so expected & actual are the correct way around
Move Phinx-type references to interface constants

By moving the Phinx types to constants, code within the adapters is more readable. The adapter-specific column type strings are clearly distinguishable from the abstract Phinx types (both were represented as similarly formatted strings). As well, having the tool's supported types collected together in the AdapterInterface helps in understanding the code's architecture, and will facilitate developing new adapters.
** Create a new command

This command works like phinx status, but with a difference, it print on the screen a json object like this:

[
{"status": "up/down", "migration_id": "", "migration_name" : ""},
{"status": "up/down", "migration_id": "", "migration_name" : ""}
]

Motivation to do this: Sometime u execute phinx in a CI tool or in a Deploy script and with the default output it´s hard to get the list of migrations.
cleanup readme
Remove the statusjson command and create a new argument -f on the status command wich print on the screen a json object with the migrations.
Add the default value to $format argument in the Manager::printStatus() method.
Adding Unit Test to Status command and format argument.
Merge pull request #222 from rsdevigo/feature/statusjson

Add JSON reporting for the status command
Adding JSON type for Postgres, as well as biginteger for all other database types.
Adding documentation on valid column options.
Merge pull request #227 from brandonsavage/doc_improvement

Adding JSON type for Postgres, as well as biginteger for all other database types.
Merge pull request #228 from brandonsavage/options_docs

Adding documentation on valid column options.
Merge pull request #220 from cyrusboadway/feature/refactor-types-to-constants

Move Phinx-type references to interface constants
Typo in PostgreSQL adapter, rollback didn't work
Merge pull request #235 from kryoz/patch-1

Typo in PostgreSQL adapter, rollback didn't work
clean up command help and warnings
Merge branch 'develop' of https://github.com/dangerousdan/phinx into dangerousdan-develop