Update API documentation.
Update import. #performance
Add the Hoa\Compiler\Exception\Lexer exception.
mv matchesLexem matchLexeme
Prevent a token that matches an empty value.

If a token matches an empty value, a Hoa\Compiler\Exception\Lexer will
be thrown.
Optimize lexing. #performance

We replace a call to strpos() with a modified regular expression. In
fact, “0 === strpos(…)” is strictly equivalent to “^($regex)” in the
preg_match() call.
Moreover, we can remove a call to count().
[auto] Merge from Compiler

    • #c63134f — Update API documentation. (Ivan Enderlin, 2013-05-22)
    • #9f86af4 — Update import. #performance (Ivan Enderlin, 2013-05-22)
    • #97f6999 — Add the Hoa\Compiler\Exception\Lexer exception. (Ivan Enderlin, 2013-05-22)
    • #6c68e17 — mv matchesLexem matchLexeme (Ivan Enderlin, 2013-05-22)
    • #255a4ef — Prevent a token that matches an empty value. (Ivan Enderlin, 2013-05-22)
    • #39e8900 — Optimize lexing. #performance (Ivan Enderlin, 2013-05-22)

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Merge remote branch 'library-compiler/master'