Merge pull request #56 from Focus-Flow/feature/styled-sitempaindex

Feature/styled sitempaindex
Remove translatable filter.
Remove deprecated methods
check is_numeric instead of is_float for $priority

fix https://github.com/silverstripe-labs/silverstripe-googlesitemaps/issues/66#issuecomment-52112157
Merge pull request #68 from lerni/master

check is_numeric instead of is_float for $priority
ajust css/js path in xml-sitemapindex.xsl

matters if root is in a subdirectory
Merge pull request #69 from lerni/master

adjust css/js path in xml-sitemapindex.xsl
Fix issue where the last mod timestamp of the sitemap index file wasnt using the most recently last edited timestamp, but the last item in the stack. Update test to check this, and include test for changeset bbd5e29
Merge pull request #70 from nfauchelle/master

Fix issue with last mod timestamp of the sitemap index file
Added instructions to flush sitemap
Merge pull request #71 from nickspiel/patch-1

Added instructions to flush sitemap
add X-Robots-Tag header

adding the X-Robots-Tag header might be a good thing, 
as it prevents the sitemap itself from getting indexed by google and showing up in the SERPs

see https://developers.google.com/webmasters/control-crawl-index/docs/robots_meta_tag
Merge pull request #74 from gherkins/patch-1

add X-Robots-Tag header
Merge remote-tracking branch 'upstream/master'

Conflicts:
	code/GoogleSitemap.php