[FEATURE] Replace meta and link tags

This update replaces meta and link tags of the active document if its "body"-content is replaced by the cached "body"-content. 

There are to new default options for this, metaTags and linkTags. So you can define your own tags.

What do you think about this?
Combined head tags replacement

What do you think about this one?
updated replaceHeadTags method
updated replaceHeadTags method
fixed wrong indentation
Merge branch 'master' into patch-3
#60 Check for pushState support before runing
Update smoothState.jquery.json
Update README.md
Update README.md
Update README.md
Update README.md
Update README.md
Merge remote-tracking branch 'upstream/master'
Merge branch 'patch-3'