First attempt at adding laziness to the SqlProvider
Working Laziness

Only tested for SQLServer at the minute
Tidying and adding the ability to read a connection string from config file.
Providers now consider referenced assemblies when searching for Db Drivers.
Maintained precedence for resolution of assmeblies when deployed
Merge branch 'master' of https://github.com/colinbull/SqlProvider
Updates to resolution paths to fix issue