Remove NLog and Log4Net projects, nuspecs and build tasks.
Update SqlLite, Npgsql, MySql and FirebirdSql packages.
Update JSON related packages
Update Raven packages
Use version ranges in Mongo and Raven persistence packages. Fix EventStore package dependency to 3.2.
Merge pull request #177 from damianh/UpdateSqlRelatedPackageDependencies

Update SqlLite, Npgsql, MySql and FirebirdSql packages.
Merge pull request #178 from damianh/NuspecVersionRanges

Update NoSql package dependencies and fix nuspec version specifications
Merge pull request #175 from damianh/Issue128RemoveLoggingPackages

Remove NLog and Log4Net projects, nuspecs and build tasks.
Docs migrated to repo wiki
Converted persistence acceptance tests to XUnit. Split out persistence acceptance tests for each implementation