Report bind parameters on failure.

Review: https://reviews.apache.org/r/24939
MESOS-1208: Add -Wno-unused-local-typedefs if gcc version is >= 4.8

Fixes `MESOS-1208`. The issue is that starting from GCC 4.8, `-Wall` includes `-Wunused-local-typedefs` by default. Since `-Werror` is also present, we end up with an error. I think the better fix would be to update boost, but this fix has less risk.

EDIT: Turns out we were already handling this, but only for GCC 4.8. Modify `configure.ac` to handle it for >= GCC 4.8 instead.

Review: https://reviews.apache.org/r/24816
Allow multiple colons for docker image.

Review: https://reviews.apache.org/r/24916
Updates latest version number in Getting Started documentation, and updates index of documentation files to reference recently-added docs.
Adds link to Authorization doc in documentation home, and updates punctuation to be consistent.
Adds Oscar Insurance and Squarespace to PoweredByMesos page.
Fix line comments end punctuation in mesos source

Review: https://reviews.apache.org/r/23707
Fix line comments end punctuation in stout
Fix line comments end punctuation in libprocess
Add line comments end punctuation style rule

Review: https://reviews.apache.org/r/23710