Add Reserved Instance Pricing Support

[serpentblade]

Updated the build process to fetch and parse reserved instance data.
Added 4 new columns for reserved instance costs
Added filter for reserved terms pricing (1/3yr, Amount paid upfront)

Thoughts before merging however:
The data I'm pulling for reserved instances is the "effective" hourly rate, which is Amazon's calculated based on upfront payment spread over every hour of the contract terms. So, actual hourly rate is lower, but has that unclear upfront cost. Should there be some indication of how this value is calculated, or a separate column for upfront cost?

[powdahound]

Perhaps a tooltip on the column would work? The "Compute Units" column does this to provide a clearer description.

[serpentblade]

Tapping into my profound ability to write content, I came up with:

Reserved costs are an "effective" hourly rate, calculated by hourly rate + (upfront cost / hours in reserved term). Actual hourly rates may vary.

Updated my commits. Perhaps that'll be good enough? Didn't want to mislead/confuse people if at all possible

[serpentblade]

Hate to bump, but was wondering if there's anything I can do or you'd like adjusted for this PR.

[powdahound]

Appreciate the bump, since I lost track of this. Will make some time this weekend to go through the open PRs and merge things in.