Implemented final comments from Yoshi.
+ added unit tests
+ removed ACE specific tlv methods
+ small nit fixes

SEUtils.jsm and unit tests are in sync with r+'ed patch version (v1.2)

Change-Id: I1f41d6069930a3e79a672ce1bcf032a2aa316dd5
Merge pull request #22 from tauzen/se_utils_p1.2_approved

SEUtils final review fixes.