Make use of `os.tmpdir()` to load ".popular.json".

This way it should work on every OS that has the environment variable set.
Merge pull request #390 from XhmikosR/extras-cross-platform

Make use of `os.tmpdir()` to load ".popular.json".
Use "uglify" filter for inline Javascript.
Minor JS formatting tweaks.
Bootlint: 0.4.0 > 0.5.0.
Merge pull request #392 from XhmikosR/uglify

Use "uglify" filter for inline Javascript.
Merge pull request #396 from MaxCDN/feature/bootlint_v0.5.0

Bootlint: 0.4.0 > 0.5.0.
Fixing minification error on bootlint 0.5.0.
Merge pull request #397 from MaxCDN/develop

Prod Release of 390 and 392

> **Note:**
>
> Purge request for `bootlint/latest/bootlint{.min.js,js}` has been requested, but not yet completed. Please allow a little time for this to appear.