bin/deploy: Rename anaVers to ANACONDA_VERSION

ANACONDA_VERSION is a variable that could also be picked up from the
environment, and environment variables are (by convention) upper case.
bin/deploy: Change if-elsif-else block to a case statement

Makes the code more readable.
bin/deploy: replace camelCase with underscodes

Most bash style guides recommend underscores for separating words in a
complex variable name.
bin/deploy: Make indentation consistent across the file
bin/deploy: Change tabs to four whitespaces