Clean up the position function and move the menu into the screen if it goes away

[amire80]

This is supposed to fix this downstream bug:
https://bugzilla.wikimedia.org/show_bug.cgi?id=52154

[kartikm]

Errors during running tests/

Am I missing something or rtlElement is really not defined? :)

1. Setup failed on Initialization tests: rtlElement is not defined
   Source:
   at IMESelector.position (http://localhost:8000/src/jquery.ime.selector.js:321:10)
   at IMESelector.init (http://localhost:8000/src/jquery.ime.selector.js:23:9)
   at new IMESelector (http://localhost:8000/src/jquery.ime.selector.js:14:8)
   at HTMLTextAreaElement. (http://localhost:8000/src/jquery.ime.selector.js:587:41)
   at Function.x.extend.each (https://ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js:4:5347)
   at x.fn.x.each (https://ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js:4:1999)
   at $.fn.imeselector (http://localhost:8000/src/jquery.ime.selector.js:582:15)
   at new IME (http://localhost:8000/src/jquery.ime.js:22:33)
   at HTMLTextAreaElement. (http://localhost:8000/src/jquery.ime.js:361:12)
   at Function.x.extend.each (https://ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js:4:5347)
2. Died on test Fix for the lack of border of the callout triangle. #4 at http://localhost:8000/test/jquery.ime.test.js:17:8
   at http://localhost:8000/test/jquery.ime.test.js:438:2: rtlElement is not defined
   Source:
   ReferenceError: rtlElement is not defined
   at IMESelector.position (http://localhost:8000/src/jquery.ime.selector.js:321:10)
   at IMESelector.init (http://localhost:8000/src/jquery.ime.selector.js:23:9)
   at new IMESelector (http://localhost:8000/src/jquery.ime.selector.js:14:8)
   at HTMLInputElement. (http://localhost:8000/src/jquery.ime.selector.js:587:41)
   at Function.x.extend.each (https://ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js:4:5347)
   at x.fn.x.each (https://ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js:4:1999)
   at $.fn.imeselector (http://localhost:8000/src/jquery.ime.selector.js:582:15)
   at new IME (http://localhost:8000/src/jquery.ime.js:22:33)
   at HTMLInputElement. (http://localhost:8000/src/jquery.ime.js:361:12)
   at Function.x.extend.each (https://ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js:4:5347)

Summary:

Tests completed in 52898 milliseconds.
173 tests of 747 passed, 574 failed.