Reduce boilerplate with macro bundles

[philwills]

http://docs.scala-lang.org/overviews/macros/bundles.html

[philwills]

Initially I was trying to add support for 2.10 via macro-compat, but the combination of a significant API change in scala-logging and having no idea how to implement c.internal.enclosingOwner in 2.10 made me bail on that.

[cb372]

Thanks, that's much nicer!

Back in 2.10.x we had access to all kinds of useful stuff like c.enclosingMethod, c.enclosingClass, etc. But in 2.11 they decided that letting macros know too much about their surroundings was bad form and they removed all those methods. I pray that c.internal.enclosingOwner will stick around for a while ...

Here's how it used to work with Scala 2.10.3. https://github.com/cb372/scalacache/blob/0.1.1/core/src/main/scala/cacheable/Macros.scala#L16