Multilogistic: Ensure names are same between Python and SQL

- Change in multilogistic sql_in function for documentation led to
difference in the name of a parameter in SQL and corresponding python
function.
Multilogistic: Missed one name change
Documentation: Change doxygen build process

Doxygen build modifications:
    - Update doxygen requirement to 1.8.4
    - Add custom header.html with MADlib keywords and links to previous versions
    - Add custom madlib_extra.css with custom CSS
    - No colons on headers anywhere
    - Remove CSS patch and include that content in custom CSS file
    - Increase font size in TOCs
    - Enable markdown processing
    - add keywords to docs
    - increase toc.li font size
    - remove Files from topics
    - remove diagram
    - define src/images directory
- Reformat various modules to reflect doxygen changes
New Module: Timeseries analysis using ARIMA modeling

Pivotal Tracker: 54248646

Additional authors:
    Shengwen Yang <syang@gopivotal.com>
    Rahul Iyer <riyer@gopivotal.com>

Module includes:
    - Training an ARIMA model for non-seasonal univariate time series
    data
    - Forecasting future values in the time series using trained model
    - Grouping and seasonal data are currently not supported and
    are planned for future work
Documentation: Update ARIMA doc to new format
Release steps: Update release notes and other version numbers
Merge branch 'integration' into doc_kmeans
Upgrade from v1.0/v1.1 to v1.2
Merge branch 'integration' of https://github.com/madlib-internal/madlib into doc_kmeans
Edit k-means doc. Still needs a working example.