when there is a System.DBNull in the result set, return a null to javascript, (System.DBNull was returning an empty object{}

Conflicts:

	lib/edge-sql.dll
Execute stored procedure

I added the EXEC command prefix to support executing stored procedures.
I refactored the ExecuteQuery method to extract the code for setting the
parameters and processing the result set in order to use the same logic
for both executing SELECT statements and stored procedures.
path.join avoids hardcoding platform dir separator
NULL support for command input parameters
Merge pull request #6 from atifaziz/dbnull

NULL support for command input parameters
Merge pull request #5 from atifaziz/patch-1

path.join avoids hardcoding platform dir separator
Merge branch 'i_like_nulls_yay' of https://github.com/ryan-allen/edge-sql into ryan-allen-i_like_nulls_yay

Conflicts:
	src/edge-sql/EdgeCompiler.cs
Merge branch 'ryan-allen-i_like_nulls_yay'
Merge branch 'master' of https://github.com/mfcollins3/edge-sql into mfcollins3-master

Conflicts:
	src/edge-sql/EdgeCompiler.cs
update binary
Merge branch 'mfcollins3-master'
update to v0.1.2
update to v0.1.3-pre