Added logging and proper execution of commands

Fixed several issues, and ran a basic test on ironsmith itself.

Need to prevent subsequent builds on same versions

datastore/ds.go

@@ -64,7 +64,7 @@ func Open(filename string) (*Store, error) {
 
 // Close closes the bolt datastore
 func (ds *Store) Close() error {
-	return ds.Close()
+	return ds.bolt.Close()
 }
 
 func (ds *Store) get(bucket string, key TimeKey, result interface{}) error {

datastore/log.go

@@ -34,7 +34,7 @@ func (ds *Store) AddLog(version, stage, entry string) error {
 	return ds.put(bucketLog, key, data)
 }
 
-// LatestVersion returns the latest version for the current project
+// LatestVersion returns the latest version (successful or otherwise) for the current project
 func (ds *Store) LatestVersion() (string, error) {
 	version := ""