[Android] Packaging tool enable set long string in package option

Add a limit of 127 characters to package name.

Set the limit to 127 considering below factors: 
(1) In my investigation, I cannot find a official document specifying maximum file name of Android. 
(2) With Eclipse running on Linux, when we try to create an android App with name of more than 256 chars, it will be failed silently.
(3) http://stackoverflow.com/questions/13204807/max-file-name-length-in-android suggests no more than 127.   

BUG=https://crosswalk-project.org/jira/browse/XWALK-1460