Merge pull request #3 from aeppert/patch-1

Update rpmbuild.go

Fixed RPMBUILD_* constant definitions.

LabelCompare function implementation.

GoDoc reference added to the README.

Basic spec file parsing support: SpecParse, Free and SourceHeader

Added another example: rpm --eval implementation.

Added ExpandNumeric (rpmExpandNumeric from rpmmacro.h) function and test

Added Expand (rpmExpand from rpmmacro.h) function and test for it.

Added test for Vercmp function.

Merge pull request #2 from ezamriy/revert-1-more-bindings

Revert "More bindings"

Merge pull request #1 from chbmuc/more-bindings

add some bindings for rpmdb (database reading)

add some bindings for rpmfi (file info)