Update outlier_detection.rst

Add reference for One-class SVM.
Added directory checking for documentation builds, and corrected for Windows pathing
Merge pull request #3477 from kastnerkyle/docbuild_fix

[MRG] Docbuild fixes for #3475
Improve docstring of the LogRegCV model
Merge pull request #3479 from MechCoder/improve_logcv_docs

Improve docstring of Logistic Regression CV model
MAINT More robust windows installation script
MAINT move skip for unstable 32bit to _check_transformer
FIX unstable test on 32 bit windows
Merge pull request #3465 from pvnguyen/patch-1

Update outlier_detection.rst
FIX numerically unstable test_logistic.py
DOC fix references to moved examples
TST: Fix warnings in np 1.9

These break our tests
Changed _partition_estimators  signature to make it compatible with warm start.
Added warm start to random forests.
DOC whats_new.rst entry for warm_start forests
DOC mistake in comment

Didn't re-run Cython as this won't change line numbers etc.
Modified the confusion matrix example: included a normalized matrix, changed the colors and added class labels.
Merge pull request #3454 from ldirer/confusion_matrix_example

[MRG] Modified the confusion matrix example
DOC fix doc errors in utils.testing
TST stabilize check_transformer_n_iter