added base class for AJD and an example of a derived class header
added JADiag.cpp and made some of the other suggested edits
fixed some minor mistakes so that it builds
swithed to cmath for machine eps and changed includes format
changed pointer V0 to use an emtpy SGMatrix
Merge pull request #1207 from van51/feature/hashing

Made HashedDocDotFeatures thread-safe (reentrant)
added a unit test for JADiag and ifdefs for eigen3
add log(normal_cdf(x)) function
Merge pull request #1210 from votjakovr/feature/gp_binary_classification

add log(normal_cdf(x)) function
bugfixes in log-det framework
Merge pull request #1208 from lambday/feature/log_determinant

bugfixes in log-det framework
Merge pull request #1205 from pickle27/develop

added base class for AJD and an example of a derived class header
Merge pull request #1209 from van51/feature/hashing

Changed CDelimiterTokenizer behavior on consecutive delimiters
don't use reserverd keyword _C
ignore evaluate_means to fix csharp compile error
blacklist also evaluate_variance
update ocr example for new serializtion
Fixed lua detection
rational approximation unit-test added
Merge pull request #1212 from lambday/feature/log_determinant

rational approximation unit-test added