link 7.x-1.2

#1866632 by mohamadaliakbari,poiu:Adding rtl support to the link field.
#1928116 by jcfiala: Added field variable to variables for link formatter functions in hook_theme.
#2141643:Applying changes suggested by coder
#2043001 by zhuber:Add xxx to list of top level domains.--author=zhuber
#2036115 by Samvel:Validation of link field was not being properly passed through to hook_field_widget_error().
#1616752 by Taran2L:Period in names of querystring items was being replaced with underscores.
#2123277 by zhuber:Link devel generate was applying titles to links with no title set.
#1936784 by jeffam, illmasterc: Ampersands were being escaped in urls.
#1784862 by aaronbauman: Added dialog switch to code displaying available tokens.
#1914286 by facine: Fixes Title value in link_field_update_instance undefined error.
#1918850 by jsacksick: Prevents undefined variable messages in link_i18n_string_list_field_alter().