Added astor as dev prereq
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'
Builtins fix for 2 and 3, tests aswell
Added Twisted example.
Merge branch 'master' into pr/208
tell flake8 to shut up
Merge branch 'master' into pr/209
add tumblr printer
set the value of empty hy expression to []
changed try to testing for an empty list for legibility (as suggested by paultag), also added to authors
changed macro to ignore empty trees and made compiler do the substitution work
whitespace fix
Merge branch 'master' into pr/197
Add in a new core language file.

 This will let us implement common functions seen in other lisps,
 and allow them to be importable, without explicit imports. The goal
 is to keep this as small as we can; we don't want too much magic.

 I've added `take' and `drop' as examples of what we can do.
documented else / finally syntax for try / catch
Merge pull request #202 from paultag/paultag/feature/start-language-lib

Add in a language lib.
Get Hy working on Windows by making readline use conditional.
Merge branch 'master' into pr/213
Style fixes.