ENH: allow SLR to have input previous transformations
TEST: reduced number of iterations for faster execution time
Report on coverage for old scipy.
BF - make examples was confusing files with similar names, fixed
Merge pull request #481 from MrBago/bf_make_examples

BF - make examples was confusing files with similar names, fixed
Merge pull request #479 from arokem/travis-old-scipy

Report on coverage for old scipy.
DOC: corrected typo
TEST: make sure SLR(x0='rigid') == SLR(x0=np.zeros(6))
Merge pull request #480 from Garyfallidis/enhance_slr_multi

Enhance SLR to allow for series of registrations