Merge branch "release-0.7.1" into "develop"

Summary of the merged in commits:
 * 44ecd10b: Add exercises for chapter 10

Merge branch "release-0.7.0" into "develop"

Summary of the merged in commits:
 * 2b8b0b4b: Add initial version of chapter 10
 * f6da894b: Bumb version number

Merge branch "release-0.6.10" into "develop"

Summary of the merged in commits:
 * 3ef07e57: Refurbish the new new chapter 09 on maps

Merge branch "release-0.6.9" into "develop"

Summary of the merged in commits:
 * d0729194: Add new chapter 8 on map, filter, & reduce
 * e1a0dd79: Make links look nice with images

- rename all *_00_lecture.ipynb files into *_00_content.ipynb
- add links to YouTube videos at the end of the chapters
- add links to mybinder for all chapters and exercises
- remove the old chapter 8 on mappings & sets
- update the README.md and make it look nicer

Merge branch "release-0.6.8" into "develop"

Summary of the merged in commits:
 * 5f633220: Remove empty lines
 * a9756ea6: Add video and streamline content
 * 26983f19: Add video and streamline content
 * 6d2c7aea: Add video and streamline content
 * 6e681752: Add video and streamline content
 * 0151478b: Add video and streamline content
 * c1268172: Add video and streamline content
 * 4171517c: Add video and streamline content
 * 4d336e46: Add video and streamline content
 * 0f5b4392: Bump version number
 * 5d7b2c47: Add video links to the README.md

Also, split chapter 7 into two chapters.

Merge branch "release-0.6.7" into "develop"

Summary of the merged in commits:
 * 3169b196: Bump version number
 * c97c6acf: Add exercises for chapter 6

Add palindromes exercises

Merge branch "release-0.6.6" into "develop"

Summary of the merged in commits:
 * 6d1d394d: Refurbish chapter 06
 * 3ca88a8d: Streamline presentation
 * d9c11c57: Streamline presentation

- streamline old text and examples
- add new section on Unicode
- add new section on bytes
- add further resources

Merge branch "release-0.6.5" into "develop"

Summary of the merged in commits:
 * 5108f844: Bump version number
 * c1ad5d8b: Add new exercises set for chapter 04
 * 8dea642c: Streamline presentation
 * 4b8aae1f: Streamline presentation
 * ed3da36f: Add more exercises to chapter 01
 * d0a20dfd: Streamline presentation
 * cf0a8acd: Streamline presentation