add new SOCR datasets

[alxndrkalinin]

SOCRAT provides few predefined SOCR datasets, like Iris (here's how to use them locally). This task is to make more SOCR Data available via SOCRAT.

List of datasets to add:

• Antarctic Ice Thickness Dataset
• California Ozone Data
• California and US Ozone Data (separately)
• Baseball Players
• Countries Rankings (row-based)

Subtasks:

• [x] create separate data branch in your Github repo and synchronize it with SOCR/SOCRAT:dev
• [x] save each data table as .csv file (e.g. using Excel or Google Spreadsheet) and place it under _build/datasets in your local SOCRAT directory (don't use spaces in the filename)
• [x] add your datasets into the list of available SOCR datasets with meaningful name and correct URLs to the file and SOCR Data description page
• [x] test locally that loading each dataset and opening descriptions works correctly
• [x] commit changes following commit message format
• [x] place created .csv files on GDrive under SOCR_MDP_2017/SOCRAT/datasets
• [x] submit a Pull Request to SOCR/SOCRAT:dev mentioning what datasets you added

Note: if your dataset page contains multiple tables, add them as separate datasets (description link can be the same)

[alxndrkalinin]

@esther11 this looks good. couple of things before we merge the PR:

Edit Dataset section Contribute to add your datasets:

• [x] add name and description
• [x] add links to CSV file and link to the SOCR description page
• [x] add reference to the publication if SOCR description page has one

Follow the same format as used for previously added datasets.

Also, please always mention issue number in your PR so I know which task it addresses.

[alxndrkalinin]

I made some comments in your second PR

[alxndrkalinin]

@esther11 closed