summary method in glm and rlm

[wesm]

Original Launchpad bug 528757: https://bugs.launchpad.net/statsmodels/+bug/528757
Reported by: josef-pktd (joep).

summary method is currently missing in glm and rlm

Skippers proposal is to use sandbox/output.py for new style of producing printable output

[josef-pkt]

There are still some unmerged enhancements to the summary table output in Vincent's branch on launchpad.

Needs to be merged and checked by hand, because there are to many changes in statsmodels to apply it directly

[josef-pkt]

see also #70
summary-refactoring was committed to trunk

rlm and glm could have more diagnostic results in the summary tables