Pyexcel

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**Updated**

. 'built-in' as the value to the parameter 'library' as parameter to invoke
pyexcel-io's built-in csv, tsv, csvz, tsvz, django and sql won't work. It is
renamed to 'pyexcel-io'.
. built-in csv, tsv, csvz, tsvz, django and sql are lazy loaded.
. pyexcel-io plugin interface has been updated. v0.3.x plugins won't work.
. `32 <https://github.com/pyexcel/pyexcel-io/issues/32>`_, csv and csvz file
handle are made sure to be closed. File close mechanism is enfored.
. iget_data function is introduced to cope with dangling file handle issue.

**Removed**

. Removed plugin loading code and lml is used instead

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**Updated**

. `33 <https://github.com/pyexcel/pyexcel-io/issues/33>`_, handle mmap object
differently given as file content. This issue has put in a priority to single
sheet csv over multiple sheets in a single memory stream. The latter format
is pyexcel own creation but is rarely used. In latter case,
multiple_sheet=True should be passed along get_data.
. `34 <https://github.com/pyexcel/pyexcel-io/issues/34>`_, treat mmap object
as a file content.
. `35 <https://github.com/pyexcel/pyexcel-io/issues/35>`_, encoding parameter
take no effect when given along with file content
. use ZIP_DEFALTED to really do the compression

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**Updated**

. `31 <https://github.com/pyexcel/pyexcel-io/issues/31>`_, support pyinstaller

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**Updated**

. `29 <https://github.com/pyexcel/pyexcel-io/issues/29>`_, change
skip_empty_rows to False by default

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**Added**

. updated versions of extra packages

**Updated**

. `23 <https://github.com/pyexcel/pyexcel-io/issues/23>`_, provide helpful
message when old pyexcel plugin exists
. restored previously available diagnosis message for missing libraries

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**Added**

. lazy loading of plugins. for example, pyexcel-xls is not entirely loaded
until xls format is used at its first attempted reading or writing. Since it
is loaded, it will not be loaded in the second io action.
. `pyexcel-xls11 <https://github.com/pyexcel/pyexcel-xls/issues/11>`_, make
case-insensitive for file type