Update github page not to point at old binaries (and to explain how t…

…o install zlib on Ubuntu)

SNAP 2.0.3: Bug fixes for sorting, non-determinism secondary alignmen…

…ts and single-end alignment

Update manual and quick start guide links in README.md

Update binary version numbers in README

Update version number in manual

Add period to README:

1.0beta.18: Major release, integrating 5 months of dev branch. Daemon…

… mode, better multiple output supoprt, perf/bug fixes, call fewer indels, etc.

Updated manual and quick start slightly for 0.15

Posix warning messages, update version number

Fix bad edit in error strings