Replace CASE_RANGES with Character.to{Lower,Upper}Case().

[ringw]

No description provided.

[sjamesr]

The test failure is because GWT Character.to{Lower,Upper}Case does not have an overload that takes an int. Not sure right now what to do about it.

[ringw]

I got this working using a GWT super source. FYI, I can also deal with checking this in internally because it will need a special build rule.

[sjamesr]

I think if you squash these two commits into one, it'll make travis happy and we can check it in.

[ringw]

Done.

[coveralls]

Pull Request Test Coverage Report for Build 221

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 11 unchanged lines in 2 files lost coverage.
• Overall coverage decreased (-0.05%) to 93.896%

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Files with Coverage Reduction	New Missed Lines	%
/home/travis/build/google/re2j/java/com/google/re2j/UnicodeTables.java	1	99.86%
/home/travis/build/google/re2j/java/com/google/re2j/Unicode.java	10	72.0%

Totals
Change from base Build 217:	-0.05%
Covered Lines:	2938
Relevant Lines:	3129

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💛 - Coveralls

[sjamesr]

Thank you!