1.5.0 Updates

[levimcg]

Getting a branch open to use for the 1.5.0 updates to the docs. I've updated the version numbers, in addition to some other minor updates. Looks like we've got a couple of other PRs ongoing that will need to be merge into develop before we finish the the updates for this release. Once those are finished we'll need to back-merge them into this branch.

To-dos:

• [x] Update version numbers where appropriate
• [x] Back-merge shell docs updates from develop once #83 is finished
• [x] Back-merge workshop updates from develop once #85 is finished
• [x] Write and add 1.5.0 blog post
• [x] Compile changelog items in data/changelog.json

[levimcg]

FYI, @illusivesunrae @scottanthonymurray I removed the step indicator from the to-do list above based on our conversation earlier today.

[levimcg]

Ok, I've got all the other update branches merged into this one. I've tested 1.5.0 locally and can confirm everything looks good.

We can go ahead and merge this into develop and then get a separate release branch open for the merge into master.