RF - improve local_maxima function to return more relevant peaks.
TST - added a few more tests for local_maxima
Started working on a simple multi-tensor simulation
TST - added test for neighboring points to test_local_maxima
BF added noise correctly
Added check for u=vat the top of the function to remove warning
TEST updated test for the multi_tensor case
DOC in multitensor simulations added
Merge pull request #126 from MrBago/improve_local_maxima

Improve local maxima
Corrected the docstring
Merge pull request #127 from Garyfallidis/sims-mtensor

Adding multi-tensor simulation