Add in PCRE dependency to Travis
Merge pull request #2704 from staticfloat/travispcre

Add in PCRE dependency to Travis
pow: remove mention of no-longer-existent function
README.windows file. closes #1926 and closes #2006
fix some formatting in README.windows
Update README for Windows instructions.
Remove mention of D3 from the README. Web REPL is now a separate package.
Remove lighttpd.conf