Update README.md

changing feature and help links
Merge pull request #2141 from marutosi/finn/release/3.0/README.md

Update README.md
Revert "Fix sprockets file exposure vulnerability"

This reverts commit 17c666c8dc39a482ca8afa6f3c3fb048ed6428a0.
Revert "update rails to 3.2.20"

This reverts commit 2d785b257055c4e12d48fb1b6bac1960d6793f80.
update rails to 3.2.20

This is a security fix against a file existence exposure CVE-2014-7819

see:
http://weblog.rubyonrails.org/2014/10/30/Rails_3_2_20_4_0_11_4_1_7_and_4_2_0_beta3_have_been_released/

Conflicts:
	Gemfile.lock
[#17176][release 3.0][real fix CVE-2014-7819] use 2.2.3 based sprockets

https://community.openproject.org/work_packages/17176

https://groups.google.com/forum/#!topic/rubyonrails-security/doAVp0YaTqY
> Fixed Versions:     3.0.0.beta.3, 2.12.3, 2.11.3, 2.10.2, 2.9.4, 2.8.3, 2.7.1, 2.5.1, 2.4.6, 2.3.3, 2.2.3, 2.1.4, 2.0.5