spacelab: fix button hover and active states, closes #197
bump version to v3.1.0+1 in css files
cupid: fix h1 and h2 in alerts and panels
Losslessly compress images.

Before: 464 KB (476.120 bytes)
After:  418 KB (428.799 bytes)
Merge pull request #209 from XhmikosR/images

Compress images
Update HTML files.

* Move meta charset first
* Remove unneeded default script type
* fix some validation errors from index.html
Trim trailing spaces and convert tabs to spaces.
index.html: use the relative link to 2.x pages.
Revert the validation fixes until the problem is reported and fixed upstream in gh-buttons.
2.x pages: use html5shiv from OSSCDN like the Bootstrap docs.
Merge pull request #210 from XhmikosR/gh-pages

Tweak HTML files
Exclude more files when generating the site.
More tabs to spaces.
Update dependencies.
Merge pull request #211 from XhmikosR/gh-pages

Minor tweaks
flatly: drop lato 900 weight, use 400 for headings
update bootstrap to 3.1.0
update jquery to 2.1.0
3.1.0 -> 3.1.1
added table tr.info to preview pages