add ER and Ez, partial fix to #54
also add ER and Ez in docs, fixes #54
add function to calculate mean Omega as a function of angle along the stream, also add tdisrupt parameter
use new meanOmega to predict the track of the stream
add bovy_conversion API for #100
change default sigMeanOffset
allow previously integrated orbits to be re-used
re-use integrated progenitor orbit as much as possible
revert back to old manner; add note
store jacobians and calculate the stream track in lbetc. coordinates
use multiprocessing for determining the stream track
add explanation of galpy's units and bovy_conversion, fixes #100
add warning message to actionAngle docs
add explicit sigangle parameter
some code to find where on the track we are, but doesn't work
add cholesky functions to util
interpolated the calculated stream track
simple algorithm to find the closest track point
add approximate aA calculation along the stream; could be sped up
flag whether to interpolate the stream track while setting up or not