Add 'asm' as a C keyword.

The C standards allow the use of inline assembly with the `asm` keyword (see
?J.5.10 of C99 for example). This commit adds 'asm' as a supported keyword to
the base C lexer, `CFamilyLexer`, and removes it from `CppLexer` which inherits
from this base. The intended effect is supporting the `asm` keyword for the C
lexer, while leaving the behaviour of the C++ lexer identical.

Side-effects of adding this keyword are that 'asm' is now also supported as a
keyword in the following lexers:

 - CUDA. Inline PTX assembler is supported in CUDA with this syntax, so this is
   correct.
 - eC. It claims to be a superset of C, so this is correct.
 - nesC. As far as I can tell, nesC supports inline assembly through the same
   syntax, so this is correct.
 - Objective-C. I believe inline assembly is supported in Objective-C, but
   using the keyword `__asm__` instead, so this is somewhat incorrect. However,
   note that the Objective-C++ lexer currently incorrectly supports `asm` as
   well.

Closes #1219

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