Contexts can come from other texts other than the token

[gkunter]

Originally reported by: gkunter (Bitbucket: gkunter, GitHub: gkunter)

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ISSUE:
Currently, Corpus.get_context() ignores whether the words within the context span are also from the same text as the query match. For example, a match that is the last token of one text will be printed with the first words of the next text as the right context;

SOLUTION:
Change the logic of get_context() so that start and end take the beginning and end into consideration.

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• Bitbucket: https://bitbucket.org/gkunter/coquery/issue/4

[gkunter]

Original comment by gkunter (Bitbucket: gkunter, GitHub: gkunter):

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FIXED:
The SQL query that handles context retrieval now includes a WHERE clause with source_ids.

[gkunter]

Original comment by gkunter (Bitbucket: gkunter, GitHub: gkunter):

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Fix Issue #4: contexts do not extend beyond source bondaries.