Merge branch 'improve-readability' into 'master'

Set max-width for README, issue and merge request description

It allows easier text reading on big screens

### Problem

Text is hard to read on wide screens:

![Screenshot_2015-08-14_11.33.39](https://gitlab.com/gitlab-org/gitlab-ce/uploads/2bdb092c09495c7aa94b0589df4b7e65/Screenshot_2015-08-14_11.33.39.png)

### Solution

Set max-width to content. Screenshots:

![Screenshot_2015-08-14_11.31.54](https://gitlab.com/gitlab-org/gitlab-ce/uploads/00cd7a77b81b30458a1675ec562d7463/Screenshot_2015-08-14_11.31.54.png)
![Screenshot_2015-08-14_10.53.16](https://gitlab.com/gitlab-org/gitlab-ce/uploads/4756f87a3bbb7179e55b1c8f8ee40459/Screenshot_2015-08-14_10.53.16.png)

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

See merge request !1161

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