Initial FilteredKeywordsImport

Initial FilteredKeywordsImport
NuGet config

for LinqToExcel package
Reworked to generate SQL script from imported data

generate SQL instead of connecting to DB directly and reuse
StringExtensions class for whitespace removal
remove unused references
added unit tests
nuget in new lib project
replace delete with truncate
replace comments with more descriptive methods
cleanup based on comments
Merge pull request #1 from infospace/1188-BadTermsToReject-FilteredKeywordsImport

1188 bad terms to reject filtered keywords import