Adds functionality to find_MAP, allowing for the use of minimization functions
that do not require a gradient. Also adds basic tests for find_MAP. Addresses
concerns in issue #396.
Fix python 3 compatibility

Use __code__.co_varnames instead of func_code.co_varnames, for python 3
compatibility. Should pass travis CI testing now.
Use `getargspec` and `close_to` rather than handmade

Updates the search for fprime to use `getargspec`. Also uses `close_to` rather
than asserting a handrolled boolean.
PEP8 Fixes
More PEP 8 Fixes

Cleaned up a few more PEP violations
Merge pull request #398 from bjedwards/master

Adds functionality to find_MAP