Merge pull request #877 from karlnapf/master

added epsilon and tube_epsilon for model selection
Merge pull request #878 from karlnapf/master

kernel selection for linear time mmd for modular interfaces
Ignore gcda file extension
Fixed totally wrong tapkee integration feature access callback
Added gcda for clear target
Removed unnecessary and memory-wise wrong distance initialization in laplacian eigenmaps
add eclipse project file
Fix serialization of Sparse features

- remove inplace (de-)constructors for SGSparse
- add malloc support for SGSparseVector<T>
- enable unit test for sparse feature serialization
Commented out unused projecting functions to avoid unhandled memory
Fixed lost nullspace shift in LLTSA
renamed test
unit tests for kernel selection
Merge branch 'mmd_kernel_selection'