Added "lang=x;" declaration to grammar

Every svel file needs to start with a line "lang=x;"
Currently only Java recognized
Added Python reserved words to lexer

Also slightly changed "unrecognized language" error message
Merge branch 'master' of https://github.com/svelTest/svelTest
Merge branch 'master' of https://github.com/svelTest/svelTest
Updated compiler to accept "lang=None;"

For simple program like cl_add.svel, don't need overhead of jfileutil/jfunct/etc.
Merge pull request #47 from kaitlinhuben/master

Added "lang=x;" declaration to compiler (including "lang=None;")