Merge pull request #95 from argius/develop

Fixed: ModelGenerator doesn't shows Usage when arguments is not enough
Added errorMessages accessor
Fixed Params does unnecessary exatraction and may return Some(null)
Fixed non-default belongsTo relation is ignored when the mapper has no hasMany relation
version 1.0.0-RC8

 - [common] Added Pagination class & builders
 - [common] Added DateTimeUtil.toString(DateTime)
 - [mailer] Fixed Typesafe Config's exception when key is absent in conf file
 - [orm] Added Pagination parameter to Finder/Querying APIs
 - [orm] Fixed non-default belongsTo relation is ignored when the mapper has no hasMany relation
 - [framework] Added SkinnyHttpSession#getAs[A](String) to access session attributes
 - [framework] Added SkinnyApiResource to provides only REST API endpoints
 - [framework] Fixed beforActon/afterAction's priority issue among action definitions
 - [framework] Fixed query string for DELETE requests by skinny-framework.js
 - [framework] Fixed inefficient count queries from SkinnyResource
 - [framework] Enabled SkinnyResource be able to customize how to find resources
 - [framework] Fixed renderWithFormat returns Option#toString in some cases
 - [framework] Added keyAndErrorMessages, errorMessages accessor to SkinnyController
 - [build] Settings files and helper scripts for deploying to Heroku by @cb372
 - [reverse-scaffold] Enabled adding namespace to reverse-scaffold command
 - [model-generator] Fised model generator shows stacktrace instead of usage by @argius
Added skinny server command
Switched from grizzled-slf4j to skinny-common
Disabled scoverage by default because it doesn't work fine with Skinny ORM for now
Fixed a warning by https://github.com/skinny-framework/skinny-framework/pull/92
Fixed findResource in SkinnyResource
SNAPSHOT
Fixed duplicated errors from MapValidator, improved UsageSpec
Fixed #96 Invalid code generation for ParamType.ByteArray