Update redmine to latest version and use its own ruby deps
Redmine needs it own version of ruby rails and dependencies.
Please cherry pick following commits:
Redmine upgrade:
commit:c43f9c90
New redmine deps:
commit:ca36810e
commit:4c314f0e
commit:fb00e5a1
commit:a9e7db51
commit:2e0100cd
commit:738b411a
commit:8d0dc550
commit:b7046410
commit:3606db4e
commit:6d92032e
commit:58355231
commit:fe6d2947
commit:7545a853
commit:26102159
commit:ce0ccad0
commit:04adeb07
commit:627ee700
commit:85b0a623
commit:718ad99a
commit:3c712bb5
commit:fc6d56ce
(from redmine: issue id 2256, created on 2013-09-16, closed on 2013-10-02)