-added unbiased estimator for marginal likelihood.
-new class for probability distributions and a Gaussian for sampling and log-pdf (numerically stable)
-log-sum-exp and log-mean-exp in CMath
-CLikelihood model now is able to evaluate many likelihoods at once
-some fixes
Squashed commit of the following:

commit f475b175e669447c57eb50087255097628573aa8
Author: Heiko Strathmann <heiko.strathmann@gmail.com>
Date:   Thu Aug 1 12:00:34 2013 +0100

    updated written tag in license

commit 0b7631fdb3a0c159f0bae4ad58b980dca62075fa
Author: Heiko Strathmann <heiko.strathmann@gmail.com>
Date:   Thu Aug 1 11:58:12 2013 +0100

    removed debug and lowered unit test accuracy

commit 0fa88a4595fa9d2c252c43959dc5783058a613d2
Author: Heiko Strathmann <heiko.strathmann@gmail.com>
Date:   Thu Aug 1 11:46:57 2013 +0100

    proper handling of kernel scalling

commit 3b40b55d507cf1a4e9fd3ba637b92e94359f718b
Author: Heiko Strathmann <heiko.strathmann@gmail.com>
Date:   Thu Aug 1 10:54:54 2013 +0100

    romans comments

commit 0b654c29656d5f896011aff7851106974a18d2a9
Author: Heiko Strathmann <heiko.strathmann@gmail.com>
Date:   Wed Jul 31 20:00:22 2013 +0100

    cleaned up header

commit 662d34f3cc9398f2d57bae06a4d5591eb1495b0b
Author: Heiko Strathmann <heiko.strathmann@gmail.com>
Date:   Wed Jul 31 19:51:34 2013 +0100

    doc update

commit d6d6c9d142fae5341af25d1bc533f4d2404e39b5
Author: Heiko Strathmann <heiko.strathmann@gmail.com>
Date:   Wed Jul 31 19:49:33 2013 +0100

    doc updates

commit 86c832219829fa8514e2f3569bd52e8ec3d494bd
Author: Heiko Strathmann <heiko.strathmann@gmail.com>
Date:   Wed Jul 31 19:45:48 2013 +0100

    added unit tests for laplacian inference method binary marginal likelihood sampler

commit 1e29f674c7cfe5226c84bf14863cf53a1d2f8148
Author: Heiko Strathmann <heiko.strathmann@gmail.com>
Date:   Wed Jul 31 19:45:17 2013 +0100

    fixed some bugs that caused wrong results

commit 82ad8b5dadea61ce2a0978d641b4189792a0fd9d
Author: Heiko Strathmann <heiko.strathmann@gmail.com>
Date:   Wed Jul 31 18:28:46 2013 +0100

    few documentation updates

commit fe3666d3888611f49222a7fdc2ebeea9aa4d1f0b
Author: Heiko Strathmann <heiko.strathmann@gmail.com>
Date:   Wed Jul 31 18:23:56 2013 +0100

    first version of unbiased estimator for log-marginal-likelihood

commit 0aa84503317bd1f02c0e0899c69f0d54c726d6d1
Author: Heiko Strathmann <heiko.strathmann@gmail.com>
Date:   Wed Jul 31 18:23:06 2013 +0100

    added new method to evaluate the log-likelihood of multiple f functions and a unit test

commit 8d19f2c2ca35c0ab3a40092b786c2a816d21270f
Author: Heiko Strathmann <heiko.strathmann@gmail.com>
Date:   Wed Jul 31 18:22:40 2013 +0100

    added log-sum-exp and log-mean-exp trick and a unit test for each

commit 6939085448fb59a9c7a22920ea61dbf00e074cd2
Author: Heiko Strathmann <heiko.strathmann@gmail.com>
Date:   Wed Jul 31 16:17:37 2013 +0100

    added a bunch of tests for the new Gaussian distribution class

commit 71e16630c7a0300965c08fa19f349bed61eab44d
Author: Heiko Strathmann <heiko.strathmann@gmail.com>
Date:   Wed Jul 31 16:17:00 2013 +0100

    removed TODO lines since I added tests a while ago

commit 7c74314f50153c14a2d01e041af858af36dcd68d
Author: Heiko Strathmann <heiko.strathmann@gmail.com>
Date:   Wed Jul 31 16:16:36 2013 +0100

    method will stay for now

commit f3f568e95713b0cf50f1cab52c55ab01049987f5
Author: Heiko Strathmann <heiko.strathmann@gmail.com>
Date:   Wed Jul 31 16:15:04 2013 +0100

    sampling and log-pdf for Gaussians now works

commit 423bbc329caa2a36b6a649bb1c7f173a950adc3f
Author: Heiko Strathmann <heiko.strathmann@gmail.com>
Date:   Fri Jul 26 13:24:52 2013 +0100

    some interface changes and a first log-pdf implementation

commit c83398d9b93d05b6abc5b818615fd9586498f44a
Author: Heiko Strathmann <heiko.strathmann@gmail.com>
Date:   Thu Jul 25 19:59:46 2013 +0100

    mentioned pseudo-marginal GP and new GaussianDistribution class

commit c5f98915b1bca1cc5da9c4ca92d988d05541d1a3
Author: Heiko Strathmann <heiko.strathmann@gmail.com>
Date:   Thu Jul 25 19:55:50 2013 +0100

    another minor doc update

commit 66ded9a4f64781af12a014a052f45f0a322fda6e
Author: Heiko Strathmann <heiko.strathmann@gmail.com>
Date:   Thu Jul 25 19:54:24 2013 +0100

    minor documentation updates

commit b9f92db9dad4eee7bde26cac4cd18f70f7eb6edc
Author: Heiko Strathmann <heiko.strathmann@gmail.com>
Date:   Thu Jul 25 19:50:29 2013 +0100

    some minor additions

commit 589fe3fc35e4f1b57670c0cd80e8ee9c952b6e25
Author: Heiko Strathmann <heiko.strathmann@gmail.com>
Date:   Thu Jul 25 19:40:47 2013 +0100

    added a skeleton for sampling the marginal likelihood using the current inference method's posterior approximation

commit 0b6ac9d5a05f947bd1d39cc56cb8997502efbf57
Author: Heiko Strathmann <heiko.strathmann@gmail.com>
Date:   Thu Jul 25 19:39:59 2013 +0100

    new class of classic probability distributions added and started on an implementation for a Gaussian