Update and reorganize README.

Add an install-dev-dependecies script instead of instructions, describes
branching structure, and emphasizes Getting Started instructions.
Fix pre-push testing.
Add back libxslt1-dev requirement.
Add more dependencies.
Added roddis.net & stevenroddis.com
Merge pull request #524 from TK-999/master

[Fazekas] Unbreak after changes
Merge pull request #523 from StevenRoddis/me

Added roddis.net & stevenroddis.com
[BGPmon] Send .com to .net.
[BGPmon] Removed surplus whitespace.
[BGPmon] Made target rules clearer.
[BGPmon] Corrected . in ruleset.
[BGPmon] Put .net targets first for consistency.
[BGPmon] Match domain without subdomains too.
Merge pull request #525 from jpds/bpgmon.net-addition

[BPGMon] Added rules for .com→.net version of website.
Wolfram Language Documentation
Merge pull request #528 from MilanKral/Wolfram_Language

[Wolfram] Language Documentation
[Wikimedia] Fix arbcom.(de|en|fi|nl) subdomains

Should be arbcom-$1 not wg-$1
Fix Markdown code formatting and Transifex reference.
Merge branch 'better-docs' of github.com:jsha/https-everywhere into better-docs
Merge pull request #502 from jsha/better-docs

Update and reorganize README.