is_minor_version now calculated on save

"this" version is minor if `json` matches the last saved version...

if "this" version is minor, we don't mark prior versions as minor.
if "this" version is not minor, we carry on exactly as before.
is_minor_version bugfixes
Versionable "ignore_identical" [false] +formatting
IcingVersionBehavior::beforeSave() should just return true
ElasticSearchRequest - added $this->last
added MysqlExtended Datasource, allowing for more field types
added MysqlExtended Datasource, allowing for more field types (bugfix+docs)
readme fix
MysqlExtended Datasource, put bigint support back in place
Squashed commit of the following:

commit 308d46fdada9221757160f6dc4dc2fad12d4e1ec
Author: Matt Reishus <matt.reishus@audiologyholdings.com>
Date:   Wed Jun 18 14:03:30 2014 -0500

    ElasticSearchRequest::search() - Support min_score

commit af285ca3e97427e2f545de95245e42b2030ede20
Author: Matt Reishus <matt.reishus@audiologyholdings.com>
Date:   Wed Jun 18 13:31:37 2014 -0500

    ElasticSearchRequest::search() - Return _score data

commit fb81d3f9ddb6c9f7c7ed2da9c8745e1b7b62ab31
Author: Matt Reishus <matt.reishus@audiologyholdings.com>
Date:   Wed Jun 18 13:24:32 2014 -0500

    ElasticSearchRequest::search() - reduce max memory usage by 80mb for a search returning 6,000 results
Merge branch 'master' into dev
ElasticSearchRequest logging default=falsei-in-prod, configurable
ElasticSearchRequest logging default=false-in-prod, configurable
IcingVersionable check_identical & oldData

The IcingVersionable behavior now supports the config/setting `check_identical`
  if false (default) we don't check the last saved version.

The IcingVersionable behavior now exposes the data it looks up as `$Model->oldData`;
  since it looked it up anyway, we might as well grant access to the Model.

The afterSave and saveVersion now always return a boolean (as expected)

Updated the readme and defaults to be more accurate.

Added a pro tip section to the readme
Merge branch 'master' of https://github.com/AudiologyHoldings/Icing into dev
Merge pull request #3 from AudiologyHoldings/dev

is_minor_version now calculated on save