added --legacy-kern option to drop TrueType kern if GPOS is available
Merge pull request #171 from anthrotype/dropkern2

[subset] Add --legacy-kern option to drop TrueType kern if GPOS is available

Fixes: https://github.com/behdad/fonttools/pull/171
Fix XML reading of True/False after safeEval() revert
[otData] add ULong types

In preparation for implementing AAT tables (slowly).
[AAT] Add support for 'feat' table

Reusing the otData machinery.

See discussion at:
https://github.com/behdad/fonttools/issues/178
https://github.com/behdad/fonttools/pull/180