Bug fixes for 1.6.3

- Fixed "YO! DUDE! Is it a bird? Is it a plane? NO, IT'S TEH HANGING
SEARCH FIELD!!" (issue matthewdl/Crunch#70)

- Fixed error handling for imported files (issue matthewdl/Crunch#71)

- Fixed relative `@imports` with two directories up (`../../`) (issue
matthewdl/Crunch#72)