Minor improvements to a couple of examples

spelling

Added a couple of fun ones.

Sentence structure improvement. Too many commas!

added two new items on iterating over key/value pairs and a new item on starting an HTTP server using Python.

using islice instead of my advance method

Using itemmgetter instead of a lambda in last example.

Better ngram generation code. Works with any iterator now.

added n-grams code using zip and iter

Merge pull request #2 from roycoding/patch-1

Minor text edit.

Fixing short title underline

Linked to Roy\'s blog, and mentioned the preferred way to flatten lists according to Python documentation.

Merge pull request #1 from sprt/patch-1

Fix a typo in 1.1.17