Biplist

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Added additional checks to guard against invalid plists. This includes writing and reading plists with recursive collections.

[Handle OverflowErrors when reading dates outside the range of datetime.datetime](https://bitbucket.org/wooster/biplist/pull-requests/7/handle-overflowerrors-when-reading-dates/diff)

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[Sort sets and dictionaries by key when writing.](https://bitbucket.org/wooster/biplist/pull-requests/6/sort-objects-before-writing/diff)

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Adding back in Python 2.6 support. This will be removed again in a future version.

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This release changes the type of `Uid` from a subclass of `int` to a subclass of `object`.

This change was made to address GitHub issue [\9 Ints are being turned into Uids and vice versa when both are present in a plist.](https://github.com/wooster/biplist/issues/9)

This release also bumps the minimum supported Python versions to 2.7 and 3.4.

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Fixes GitHub issue [\8 ERROR: testLargeDates (test_valid.TestValidPlistFile)](https://github.com/wooster/biplist/issues/8)

Fixes [\6 Empty Data object converted as empty string](https://bitbucket.org/wooster/biplist/issues/6/empty-data-object-converted-as-empty)

Creates 1-byte strings when possible, per [PR \4](https://bitbucket.org/wooster/biplist/pull-requests/4/create-1-byte-strings-when-possible-and/diff)

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Fixes [\5 ValueError: timestamp out of range for platform time_t](https://bitbucket.org/wooster/biplist/issue/5/valueerror-timestamp-out-of-range-for)

Merged pull request [\3 removing the `six` module while keeping Python3 compatibility](https://bitbucket.org/wooster/biplist/pull-request/3)