fix: flash was not correctly working when used with subdomains
remove rake dependency due to the following issue:
http://stackoverflow.com/questions/3183495/
Merge branch 'remove-rake-dependency' of git://github.com/lulalala/unobtrusive_flash into lulalala-remove-rake-dependency

Conflicts:
	lib/unobtrusive_flash.rb
	unobtrusive_flash.gemspec