Added lib curlTest project:

1. Tested easy interface;
2. Tested write data function call back (it's called when a segment of data is received).
Added GetDateDifference Project (incomplete).
Updated GetDateDifference Project:

Fixed leap year bug.
no message
Added inheritanceTest.
Added GetPrimeFactors.
Removed arithmetic projects.
Merge branch 'develop' of https://github.com/genxium/Misc