Add a couple of questions and a new exercise

exercises/programming/grep_berfore_and_after.md

@@ -0,0 +1 @@
+Implement the following grep command in Python (numbers can be different): `grep error -A 2 -B 2 some_file`

exercises/programming/web_scraper.md

@@ -0,0 +1,8 @@
+## Web Scraper
+
+1. Pick a web site to scrape
+2. Using any language you would like, write a web scraper to save some data from the site you chose
+3. Save the results to a database (doesn't matter which database, just pick one)
+
+
+* Note: if you don't know which site to pick up have a look [here](http://toscrape.com)