Added two kernels to existing SVM framework
Histogram intersection kernel (accessible by using SVM::INTER in CV namespace as kernel_type)
Exponetial chi2 kernel (accessible by using SVM::CHI2 in CV namespace as kernel_type)

Formulars:
Exp-CHI2
k(x,y) = exp(-gamma * CHI2(x,y))
CHI2(x,y) = 1- 2* SUM_i[(xi-yi)²/(xi+yi)]

Intersec
k(x,y) = SUM_i[min(xi,yi)]
Changed line 1266 in svm.cpp to allow the new kernels to be used
Corrected a mistake in CHI2 kernel in line 354 and line 362 svm.cpp
Added new kernels to documentation
Remove all using directives for STL namespace and members

Made all STL usages explicit to be able automatically find all usages of
particular class or function.
Fix x64 build warnings
fix lying assertation and hard-coded shrinkage
Merge pull request #545 from cuda-geek:fix_lying_assertation
Merge pull request #490 from mschoeler:master
Merge pull request #543 from taka-no-me:explicit_stl
Fix definition of the covariance matrix of derivatives.
Repair build
Merge pull request #566 from FabricioS:master