ENH : Draft of RCParmamDict

 This is a class for keeping track of default values.  It is a recursive
dictionary so we get some notion of namespaces.
Merge pull request #3 from tacaswell/rc_params

ENH : Draft of RCParmamDict
DEV : configure travis
Merge pull request #12 from tacaswell/travis_config

Travis config
MNT: Added default value handling for the 'nx' parameter in 'bin_1D'
MNT: Added test for default value handling of bin_1d
BUG: Fixed bug in bin_1d testing method
DOC: Updated docstring on RCParamDict to be more verbose
DOC: Minor fix to bin_1d docstring
Merge pull request #15 from ericdill/rcparams_doc

DOC: Updated docstring on RCParamDict to be more verbose
Merge pull request #14 from ericdill/bin_1D

Added default value handling in bin_1d and a corresponding test
ENH/DOC: Updated keys_core and some docstrings in core.py
DOC : stub for wedge integration (caking)
MNT: Updated keys_core to include a 'units' entry for each key
DOC: Fixed description in keys_core
Merge pull request #16 from ericdill/doc

update to keys_core and documentation
Merge pull request #19 from tacaswell/caking_spec

DOC : stub for wedge integration (caking)
DOC : added logging related documentation
ENH : added logging infrastructure
DOC: Minor edits, added links, etc...