Provides Bidiagonal matrix type and specialized SVD

Provides LAPACK.bdsqr! and LAPACK.bdsdc! wrappers

Also fixes typo in tridiag
Added new section on writing Julia packages.
Fix URL typos from capitalized J
Merge pull request #2714 from jiahao/doc-makepkg

Added new section on writing Julia packages.
Merge pull request #2713 from jiahao/bdsqr

Provides Bidiagonal matrix type and specialized SVD
Change up libdouble-conversion in deps/ to allow for USE_SYSTEM_GRISU, and enable that in Travis builds
add missing python-2.6.7_msys.7z link

add missing python-2.6.7_msys.7z link
Updates to package list
Merge pull request #2718 from wlbksy/patch-1

add missing python-2.6.7_msys.7z link
Adds cross-multiplies between Bidiagonal and {,Sym}Tridiagonal or scalars
wait_accept should be exported from Base.
Merge pull request #2723 from astrieanna/waitaccept

wait_accept should be exported from Base.
Merge pull request #2717 from staticfloat/systemdoubleconversion

Change up libdouble-conversion compilation
Merge pull request #2720 from jiahao/scalars

Adds cross-multiplies between Bidiagonal and {,Sym}Tridiagonal or scalars
Attempt to get the code blocks to render in the packages documentation in the manual
Some more documentation for packages.
Add packaging links to CONTRIBUTING.md.
Add Clang.jl to CONTRIBUTING.
Remove links to wiki on Code Patterns and Type Hierarchy. These
could perhaps be updated and reinstated in the documentation.
Merge remote-tracking branch 'upstream/master' into kd/farm