Update docs badge in README

Update the URL of the docs badge to include it from inch-ci.org instead of inch-pages.github.io (the former being the successor of the Inch Pages project).

[ci skip]
Merge pull request #363 from rrrene/patch-2

Update docs badge in README
[Liquid] Add round, ceil and floor standard filters
Merge pull request #368 from Shopify/add-round-ceil-and-floor

[Liquid] Add round, ceil and floor standard filters
add additional tests for https://github.com/jekyll/jekyll/pull/2505
Unfreeze version string

It breaks gem installation on ruby 1.9.x (older rubygem?)
Merge pull request #371 from Shopify/unfreeze-version-string

Unfreeze version string
Canonicalize travis ruby versions
Do not intall stackprof under jruby nor rubinius
rbx-19mode is not supported anymore
Fixed relative link
Merge pull request #375 from Shopify/relative-link

Fixed relative link
Merge pull request #374 from Shopify/remove-duplicate-ruby-version

Give some :heart: to travis.yml
Allow tag classes to be reloaded when using Liquid.cache_classes is false

Because Liquid keeps a reference to tag classes, Rails class reloading may
cause problems with custom tags. This commit introduces a setting that
allows these classes to be resolved when required.
Merge pull request #376 from Shopify/tag-class-reloading

Avoid holding on to stale tag classes
add regression tests for #377
Revert "Merge pull request #352 from gaiottino/master"

This reverts commit 553b0926ae28103475fd66e6637af855a81ddb0e, reversing
changes made to 628ab3dc6a702d87340a6fdd9715d9ef54fab786.
Merge pull request #378 from Shopify/revert_352

Revert: Add error messages for missing variables when :strict
Profile liquid rendering

Add a simple profiling system to liquid rendering. Each
liquid tag ({{ }} and {% %}) is processed through this profiling,
keeping track of the partial name (in the case of {% include %}), line
number, and the time it took to render the tag. In the case of {%
include %}, the profiler keeps track of the name of the partial and
properly links back tag rendering to the partial and line number for
easy lookup and dive down. With this, it's now possible to track down
exactly how long each tag takes to render.

These hooks get installed and uninstalled on an as-need basis so by
default there is no impact on the overall liquid execution speed.