- adds support for opening links in new tabs with meta keys (thank yo…

…u so much @danprince)

- pageAccelerator doesn't execute on links with target="_blank"

- add beforeLoading parameter

- add afterLoading parameter
- fix problem with loading stylesheet (#19)

- add logic to don't try to accelerate links started with "#"

- fix problem to update attributes on browser back

- add support to amd and commonjs

- fix problem on browser back

- fix problem with updating body attributes on browser back

- add logic to don't try to accelerate external links