ready for release 1.0.0

[bvreede]

Closes #36 Closes #15 Closes #43 Closes #48

Before merging:

First close other existing PRs:

• [x] #35
• [x] #37
• [x] #38

And address issues:

• [x] #29
• [x] #30
• [x] #40
• [x] #41
• [x] #44

Finally: get feedback on the package:

• [x] @liekelotte
• [x] @mkuzak
• [x] @svenvanderburg

After merging this: make a new release, with version number 1.0.0 :)