Fix secure.travis-ci.org redirect

`fullpath` starts with SCRIPT_NAME. From the Rack spec:

> The SCRIPT_NAME, if non-empty, must start with /

Fixes travis-ci/travis-ci#1278.
a) author/committer emails on build page and b) PR on job page
Add Rst status image format

Close #192.
show loading indicator on show-more button click
Merge pull request #194 from floydpink/build-job-page-fixes

Fix a couple of metadata items on build and job tabs
Merge pull request #195 from floydpink/show-more-button

Show loading indicator on 'Show More' click
Fix messages on empty repos list
Change height of status image popup to include all formats

Close #196.
Fix displaying pull request number on builds' list

Commit sometimes does not have information about pull request (probably
when payload is coming from pusher).