Interpolative Decompositon: Drop id_dist and PyMatrixID into source code.
Interpolative Decomposition: build system, PEP8, names, tests.
Interpolative Decompostion: More PEP8.
Integrate Ken's latest changes, integrate into scipy tests, integrate into docs
Py3 fix for interpolative decomposition test
PEP8 scipy.linalg.interpolative
linalg.interpolative: Reformat docs into numpy/scipy format
BUG: linalg/interpolative: deal with estrank special return value for full-rank
TST: linalg/interpolative: extend and refactor test suite
ENH: linalg/interpolative: split the rand function to a separate seed and rand functions
DOC: linalg/interpolative: sew it to the sphinx docs
DOC: mention ID in release notes
ENH: linalg/interpolative: minor refactoring

In case automatic casting float32->float64 etc. is implemented one day.
DOC: shorten the linalg tutorial section on ID
Merge pull request #2616 from inducer/interpolative-decomposition

ENH: linalg: Interpolative decomposition

This takes @klho's PyMatrixID and integrates it into SciPy, so that it
builds properly and integrates with the SciPy documentation.
DOC: fix bug in dvipng options
DOC: linalg/interpolative: fix minor doc issues