Update identity_management.rst: Content

Some blurbs about Active Directory & LDAP. I apologize if the build
fails again, but I'm having some trouble getting sphinx working.
Formatting Changes

Fixed the links and bulleted lists. Successfully ran make HTML with 0
warnings or errors.
Update backups.rst
Python syntax and variables
Briefly flesh out Virtualization 101.

Add mention of private and public cloud, as well as defining terms.
Lists and Dictionaries

Added descriptions and examples for lists and dictionaries.
Basic function definitions and usage
Updates later paragraphs to current style
Merge pull request #150 from gpapilion/monitoring_101_style_changes

Updates later paragraphs to current style
Merge pull request #124 from aytch/Windows-Identity-Management

Windows identity management
Merge pull request #137 from andrew-timmes/patch-1

Update backups.rst - RAID todo
Merge pull request #139 from mikalstill/master

Define cloud terms in virtualization 101
Merge pull request #140 from jivid/master

Python intro
these were all issues raised in previous pull requests that needed to be resolved
Merge pull request #151 from avleen/fixing_pulls

these were all issues raised in previous pull requests that needed to be...
adds initial SNMP content
Merge branch 'master' of https://github.com/opsschool/curriculum into snmp_monitoring
added an ls and lsof section.
Added ls and lsof to shell_tools, builds this time.
Merge pull request #152 from gpapilion/snmp_monitoring

Snmp section monitoring_101