Support SQL Azure databases

SQL Azure requires all tables to have a clustered index. This commit
changes the primary key on the SchemaVersions table from non-clustered
to clustered.
Merge pull request #1 from julian-maughan/AzureCompatibilityFix

Support SQL Azure databases
Merge pull request #2 from JakeGinnivan/nCrunch

Setup nCrunch
Merge pull request #3 from JakeGinnivan/CodeUpgradeScript

Code upgrade script
Take away clustered spec

SQL Azure requires "clustered", while SQL CE requires "nonclustered".
Let's just go with the default.
Update README.md
Added switch to allow variables to be disabled.
Normalize line endings
Merge branch 'AdrianJSClark/master'

Conflicts:
	src/DbUp.Specification/SqlScriptExecutorTests.cs
	src/DbUp.Specification/UpgradeEngineTests.cs
	src/DbUp.SqlCe/SqlCeExtensions.cs
	src/DbUp/Builder/StandardExtensions.cs
	src/DbUp/Builder/UpgradeConfiguration.cs
	src/DbUp/Helpers/AdHocSqlRunner.cs
	src/DbUp/Helpers/TemporarySqlDatabase.cs
	src/DbUp/Support/SqlServer/SqlScriptExecutor.cs
	src/DbUp/Support/SqlServer/SqlServerExtensions.cs
Create license.txt
Made GetScriptsToExecute public