Revert "Update solarized.css"

This reverts commit 1dac7a81431058919e57e9748835e54953275a70.
Make selection background color Base02.
Merge pull request #1471 from Gozala/fix-solarized

Fix regression in solarized theme introduced by  #1384
linux_deps.sh: If 'which curl' fails, exit with its return code.
linux_deps.sh: re-use downloaded LightTableLinux*.gz, clojure-plugin

* download LightTableLinux*.tar.gz only if it doesn't exist and always
  verify its sha1 checksum.
* store clojure-plugin as a git-submodule and clone it only once. Then
  update it with git pull --rebase
linux_deps.sh: remove runner/target/lein-light-standalone.jar in the end