Squashed 'Telerik.Sitefinity.Samples.Common/' changes from a17eb52..74d36c5

74d36c5 Upgraded to Beta HF 1 (7.1.5141.0)
bcb289e Changed the check for existing thread
6d0290e Updated hintpaths
f049418 Updated import directive condition
52b0011 Merge branch 'review' of https://github.com/Sitefinity-SDK/Telerik.Sitefinity.Samples.Common.git
fc3bd09 Updated versions when SitefinityWebApp condition
91cbdc9 Updated .csproj improt StyleCop condition
05b3b74 Upgrade to Sitefinity 7.1 Beta

git-subtree-dir: Telerik.Sitefinity.Samples.Common
git-subtree-split: 74d36c5c406d24c7e9a9f9ff67b4e0e71b18cf43
Merge commit 'd6e0b8b3f9247bf05dd5c46381f52306f1f2d37e' into review
Upgraded to SItefinity 7.1 Beta HF1 (7.1.5141)