Merge pull request #92 from ovatsus/master

Remove WP7.1 demo project
Use a special purpose Freebase Key for the unit tests
Remove #if EXPERIMENTAL madness from unit tests, it's better to have some duplication
MovieDb api changed
Refactor csv inference to allow testing more parts of the algorithm

The logic that handles the optionals/nullables was mixed with the generation of provided properties, so it wasn't being tested in the inference tests.
Created PrimitiveInferedProperty type to hold the intermediate value between csv type inference and the generation of provided properties and to pass to Helpers.convertValue, instead of passing 3 different values as before
No functionality was changed at all
Generate Nullable<int64> instead of Option<int64> in csv provider to be consistent with int
Improve Units of Measure support in CSV Provider

Support SI symbols in addition to SI names
Validate that the measure really exists and ignore it instead of giving errors later
Don't require a space fix between the column name and the '(' of the unit
Improve csv column naming (Fixes #97)
Worldbank added more indicators and Freebase renamed one of the domains
Merge latest changes from sample pack to ProvidedTypes.fs
Allow overriding the schema in the CSV provider (#19)