Fix reading and writing format 13 cmap tables

* language is a 32-bit field when reading
* fix table length calculation when writing

Patch from Devon Govett <devongovett@gmail.com>
BUG=
Review URL: https://codereview.chromium.org/612653002/



git-svn-id: http://ots.googlecode.com/svn/trunk@117 a4e77c2c-9104-11de-800e-5b313e0d2bf3
1 file changed