Idigbio

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**New**

- add debug command-line option

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**New**

- add full-featured example script fetch_media.py to download media from iDigBio
- add documentation for fetch_media

**Changes**

- remove fetch_media_based_on_query.py which is superceded by fetch_media.py

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**New**

- add an example to examples directory to download media based on search query

**Changes**

- minor changes to documentation, unit tests
- remove hard-coded path to tmp directory

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**New**

- count_recordsets() function returns number of recordsets in iDigBio

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- Send etag with file on upload to verify correctness

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**Changes**

- Add media_type to upload functionality.