0.2.6 Release Candidate

Changes in 0.2.6a1:

• Remove CVXOPT from the hard requirements.
• Pandas upgrade to support 0.11
• Setup.py metadata update
• Ubuntu Installation Optimization
• Bug fix in Aroon feature
• Remove missing symbols from lists
• Event profiler bugs for 1/0 events
• Tutorials updated
• Bug fix in DataAccess
• Remove dead files and tutorials
• Update mac installation to use virtual environments