Add pkgconfig support
Remove some autotools artifacts that I should never have commited
Need an easy way to regenerate all the autotools artifacts.
Forgot to have travis autogen
Fix softtab
Forgot to remove the m4 stuff
Merge pull request #211 from jbussdieker/master

Add pkgconfig support and cleanup autotools artifacts
Use autoreconf -i and add gitkeep to m4 to make automake happy
Merge pull request #213 from jbussdieker/master

Use autoreconf -i and add gitkeep to m4 to make automake happy
Allow older autoconf version to support brew package
Lower automake dependency too for homebrew
Favor compatibility over new autoconf features
Fix invalid output or crashes when calling a mixin which takes variable arguments from another mixin *also* taking variable arguments when no arguments are passed in
Rework variable argument support to support named arguments. This requires altering arglists to store Arguments instead of the previous approach of just wrapping the passed-in Expression values, and includes changes to other functions to cope with the resulting Lists or ArgLists as appropriate
Remove unbalanced free() for source_map_file.
Merge pull request #219 from rowanbeentje/improvevariableargumentsupportv2

Improve variable argument support
Merge pull request #222 from svnieuw/master

Remove unbalanced free() for source_map_file.
allowing nth to index from the end
Merge branch 'master' into extend