DOC: clean-up docstrings of sql
DOC: fix sql docs (write example data to database)
BLD: disable MySQL in requirements-2.7 as its failing the building process
API: allow the iloc indexer to run off the end and not raise IndexError (GH6296)
Merge pull request #6299 from jreback/iloc_max

API: allow the iloc indexer to run off the end and not raise IndexError (GH6296)
clarified to_excel and read_excel

as discussed in issue GH6260
. io.rst: added a paragraph explaining the difference in behaviour from
0.12
. excel.py: added docstring for has_index_names
thanks to jmcnamara and jorisvandenbossche
ENH: pytables start/stop/selection fixes and select_as_mutlipe change

This commit fixes issues with start/stop and selection. Furthermore
select_as_mutlipe is implemented differently:
- select_column and remove now hanlde start/stop arguments
- select_as_multipe hanldes start/stop the same way as select
- select_as_coordinates and select_column works with where expressions
  that result in filters. This also fixes select_as_multipe with filters
- select_as_multipe table iterator is rewritting, so memory usage is
  constant.

select_as_multiple now will always throw a KeyError if either a key or
the selector is not found.

Also closes GH4835
Merge pull request #6177 from wabu/selection-start-stop-fixes

ENH: select column/coordinates/multiple with start/stop/selection
BLD: update iron cache secure ids
BLD: iron cache secure ids try again
BLD: iron cache update third time is the charm
BLD: import error on py2.6 for print_versions
Merge pull request #6302 from iled/doc

DOC: clarified to_excel and read_excel (GH6260)
Merge pull request #6298 from jorisvandenbossche/sql-docstring

DOC: clean-up docstrings of sql + fix doc build