Add missing .lib files

This should make it possible for folks to compile for Windows again.
Tell travis to notify build status in IRC
Posix meterpreter makefile changes

* Cleans more things
* No longer removes outputs on clean
* Changes tmp directory to be more descriptive
Add tags to .gitignore
Remove tags
Whitespace at EOL
Use a proper Makefile for libc
Explain building on POSIX
More Makefile clean up

You can now type 'make && make install' if your framework checkout is in
the same directory as meterpreter.
Tell travis we need gcc-multilib
Make VisualStudio happy with an output dir
Add missing hook.dll

Hopefully the last obstacle to compiling on Windows.