ENH: describe also where to report bugs for other projects in scipy stack.
ENH: add links to documentation of all core Scipy Stack projects.
MAINT: move docs page out from scipylib/ and add note on tutorials.
MAINT: split bug-report page in SciPy stack and lib parts.
MAINT: move guidelines on reporting bugs to scipy stack bug report page.
MAINT: fix instructions in README.txt
Merge pull request #15 from rgommers/bugs-docs-stack

Add other core Scipy Stack packages to bugs/docs pages.