Merge pull request #269 from shavac/master

improve StaticDir config file parser.
fix #265
Merge pull request #271 from shavac/master

minor fix,if path does not include ':', beego will crash of "index out of range"
fix #235
orm fix for support custom field
orm fix sqlite3 time convert
Merge branch 'master' of github.com:astaxie/beego
fix #270

同时支持全部小写和驼峰写法
fix #236
#254 add SessionHashFunc SessionHashKey SessionCookieLifeTime
fix #254
#254 add controller func SessionRegenerateID
fix #248
fix #140
fix #277
fix #277
support reverse m2m relation
orm set relation column name #259
filter http method fix #279
fix #280