Allows for multiple tables per page

[SteveLane]

This edit allows for multiple tables per page to be read using list_matrices method. If there is only one table on a page, a matrix is returned, else a list of matrices are returned.

[SteveLane]

@leeper I haven't added any tests for this - it's just the bare change. I can add tests, or anything else you'd like - just let me know.

[SteveLane]

Of course, list_characters and list_data_frames needed updating as well, sorry for the extra commits. Also - whilst testing, the non-western table check failed. The extract_tables function actually pulls in two tables. Not sure if it's the package bug, or a tabula-java bug - I'll open an issue anyway (Issue #32).

[codecov-io]

Codecov Report

:exclamation: No coverage uploaded for pull request base (master@b2e7791). Click here to learn what that means. The diff coverage is 95.12%.

@@            Coverage Diff            @@
##             master      #31   +/-   ##
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  Coverage          ?   57.82%           
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  Files             ?       12           
  Lines             ?      569           
  Branches          ?        0           
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  Hits              ?      329           
  Misses            ?      240           
  Partials          ?        0

Impacted Files	Coverage Δ
R/output.R	97.11% <95.12%> (ø)

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[leeper]

Sorry, @SteveLane, for the delay on this. I will try to get to it as soon as I can.

[pachadotdev]

let me test how these changes go with tabula 1.0.5