Add skinny-oauth2, skinny-oauth2-controller

- Moved JSON utility to skinny-json from sknny-framework
- skinny-oauth2 built on Apache Oltu
- FacebookLogin, GitHubLogin and GoogleLogin
Merge pull request #171 from skinny-framework/feature/oauth2

WIP: Add OAuth2 login controller support
Create Ivy cache before copy

If a user doesn't have ~/.ivy2/cache/ then subsequent cp will fail.
Merge pull request #172 from tkawachi/sh

Create Ivy cache before copy
Refactor SkinnySessionFilter
Add TwitterLoginFeature (OAuth 1.0a)
Merge pull request #173 from skinny-framework/feature/twitter

Add TwitterLoginFeature (OAuth 1.0a)
Add ivy cache to homebrew formula
version 1.2.9

 - [common] #168 joda-time String interpolation such as joda"now"
 - [oauth2] #171 skinny-oauth2 (easy-touse Apache Oltu wrapper)
 - [oauth2-controller] Facebook/GitHub/Google login controller modules
 - [twitter-controller] #173 TwitterLoginFeature (OAuth 1.0a)
Fix typo in GooglePlusAPI's error log
Add emails to GoogleUser
Merge pull request #174 from roundrop/fix_typo_in_google_plus_api

Fix typo in GooglePlusAPI's error log
Merge pull request #175 from roundrop/add_google_emails

Add emails to GoogleUser
Add test case for file upload feature
Add SkinnyApiResourceServlet, SkinnyResourceServlet
Fix scaladocs
Ignore environment variables when loading factories.conf refs #176
Merge pull request #177 from skinny-framework/feature/ignore-env-variables-in-factories.conf

Ignore environment variables when loading factories.conf refs #176