Roadmap for next version
========================
[X] Bugfix # 46

[ ] Bugfix # 85

[ ] Bugfix # 88

[ ] Bugfix # 95

[ ] Bugfix # 99

[ ] Bugfix # 98

[ ] Bugfix # 97

[ ] Bugfix # 96

[ ] Bugfix # 101

[ ] Bugfix # 103

[ ] Bugfix # 108

[x] Bugfix # 137

[ ] Bugfix # 152

[ ] Bugfix # 163

[ ] Bugfix # 169

[ ] Bugfix # 172

[ ] Bugfix # 181

[ ] Bugfix # 198

[ ] Bugfix # 216

[ ] Bugfix # 215

[ ] Bugfix # 230

[ ] Bugfix # 243

[ ] Add fixture for datadir

[x] Migrate tests from nose to pytest

[ ] Cleanup API of IterableWorksheet

[ ] Cleanup use of keys when writing styles

[x] Add support for Python 3.4

[ ] Improve handling of relationships

[ ] Harmonise code in optimised writer and standard

[ ] lxml based writer

[ ] Harmonise cells for reader and optimised reader -> 1.9 / 2.0

[ ] No longer infer data types when reading files? -> 1.9

[ ] Support cells with formulae in charts -> 1.9 / 2.0

[ ] Better handling of styles for multiple cells -> 1.9 / 2.0

[ ] Merge existing patches for charts -> 1.9

[ ] Default to using an iterator when working with charts? 1.9 / 2.0

[ ] Use default settings for columns
