MNT: Removed outdated project_to_sphere function

- The functionality of project_to_sphere is covered by
  processs_to_q
TST: Testing of reference image subtraction implemented

MNT: Missed some renames in the refactor

MNT: Added whitespace in conda yaml file
MNT: Added test for nx=None in refine_center test for 100% coverage

MNT: Added coverage output folder to .gitignore
ENH: Moar test coverage

MNT: Docstring and new class attribute on XrayLibWrap

MNT: dict -> verbosedict, added class attribute to XrayLibWrap's

MNT: Moar test coverage
MNT: Overhaul of 2D -> 1D and added tests for it

- renamed function
- added test coverage for it
- fixed some PEP8 violations
ENH: 100% test coverage, woo!

MNT: 100% coverage on 2D->1D image conversion

MNT: Forcing coveralls to ignore tests/ and testing/ folders

MNT: Removed the casts to arrays

MMT: Removed rr from the input parameter names
MNT: list -> deque for faster appends

MNT: kwargs updated to match api change
MNT: prepended 'opts' to the valid options for info_type

TST: Updated tests to match changes

ENH: .converage added to .gitignore

ENH: remove duplicates in gitignore and fixed coveragerc

DOC: lists of valid options added to docstring

TST: Finished comparison testing of elements

mostly doc: edits re: caswell

MNT: Renamed dict keys to match rename of inputs
DOC: Included API change docs
MNT: Brought class attribute info_type back

MNT: Removed attribute from subclass
Merge pull request #148 from ericdill/remove_unused_functions

MNT/TST : Remove unused functions and add more test coverage