changed language definition for postgres 9.2 compatibility
added btree sorting funcs for instants
file ending in ~ are now git-ignored
replaced relative position integer constants with enum
removed error return value from funtions which never errors
refactored
added enum for posttime type (instead of unnamed int constants)
added cast to and from four byte integer
Merge pull request #2 from jkraml/master

First try at pull request