Changed coefficient representation to be sparse in GLM if the number of predictors is greater than given threshold(default is 1000)
GLM2 fix: fixed bug in scoring when lambda_search was on (or use_all_factor levels was on), scoring was still skipping 0-levels and shifting the rest to the left -> scoring was completely incorrect for categoricals.

Fixed by adding explicit check whether 0 levels are to be skipped.
Glm2 fix: fixed AIOB when running with lambda search and line search (vector resize was wrong).
Added lambda_min param to glm2. It is to be used with lambda_search, specifies minimal lambda as a ratio of lambda_max.
GLM2: Added option to set best lambda from the ui.
Rename error to errorr to get R tests to pass.

The R __remoteSend method is doing a blanket check for a entry named 'error'
in the response.
Merge branch 'master' of https://github.com/0xdata/h2o
Merge branch 'master' of https://github.com/0xdata/h2o
Fix in NewChunk compression. Sparse new chunk representation can have 0s among stored values (result of calling set()) which cause assertion failure. Instead of asserting on exactly the non zeros being stored, added code to filter zeros out when compressing.
Merge branch 'master' of https://github.com/0xdata/h2o
Added pictures describing software stack.
Merge branch 'master' of https://github.com/0xdata/h2o
Merge branch 'master' of github.com:0xdata/h2o
h2o.ignoreColumns - finds variables with low variance to ignorere
Change dimensions so more of top document is visible and bottom document can show
entire page in the frame.
Added some architecture and developer documentation.
Merge branch 'master' of github.com:0xdata/h2o
Language tweaks to the docs.
Subscript fixes.
Added parse.rst and mrtask.rst.