Minor fix to sequence.py

Missing type cast caused motion correction to fail on Windows
Sped up some slow tests by clipping the dataset
Added bottleneck to travis environment
Attempting to fix bottleneck install
bug fixes in slicing _motion_corrected_sequence
bug fix for memory issue related to *it.chain
bug fixes in slicing _Motion_Corrected_Sequence
fixes for 3D extraction summary pdf

NOTE: Pools currently hang
Fix for large datasets hanging extraction pools. Added chunksize limit.
Now pass frame index in to the workers so they can be read-out unordered.
adapted imaging parameters to Prairie v5.2
support for old prairieview xml