beedb.go: use limit/offset syntax when constructing sql
Merge pull request #47 from gabstv/tags

Make beedb map structs to tables/columns by tags instead of putting underlines before capital letters
Return an error with a descriptive message when unable to save due to primary key name mismatch.
Merge pull request #49 from gabstv/inline_marshall

Added Model nesting by using the 'inline' keyword
Merge pull request #48 from martinhansdk/master

Better error handling when unable to save
Merge pull request #42 from lifelog/master

beedb.go: use limit/offset syntax when constructing sql