Add zeus plugin

Includes aliases for zeus (https://github.com/burke/zeus)

Also there is a README.md that list all aliases, ready to copy
into the wiki.

plugins/zeus/zeus.plugin.zsh

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+# Some aliases for zeus. (See: https://github.com/burke/zeus)
+# Zeus preloads your Rails environment and forks that process whenever
+# needed. This effectively speeds up Rails' boot process to under 1 sec.
+
+# Always use bundler.
+# Rails depends on bundler, so we can be pretty sure, that there are no
+# problems with this command. For all the other aliases I provided an 
+# alternative, in case people have conflicts with other plugins (e.g. suse).
+alias zeus='bundle exec zeus'
+
+# Init
+alias zi='zeus init'
+alias zinit='zeus init'
+
+# Start
+alias zs='zeus start'
+alias ztart='zeus start'
+
+# Console
+alias zc='zeus console'
+alias zonsole='zeus console'
+
+# Server
+alias zsr='zeus server'
+alias zerver='zeus server'
+
+# Rake
+alias zr='zeus rake'
+alias zake='zeus rake'
+
+# Generate
+alias zg='zeus generate'
+alias zenerate='zeus generate'
+
+# Runner
+alias zrn='zeus runner'
+alias zunner='zeus runner'
+
+# Cucumber
+alias zcu='zeus cucumber'
+alias zucumber='zeus cucumber'
+
+# Test
+alias zt='zeus test'
+alias zest='zeus test'
+
+alias zu='zeus test/units/*'
+alias zunits='zeus test/units/*'
+
+alias zf='zeus test/functional/*'
+alias zunctional='zeus test/functional/*'
+
+alias za='zeus test test/units/*; zeus test test/functional/; zeus cucumber'
+alias zall='zeus test test/units/*; zeus test test/functional/; zeus cucumber'
+
+# Clean up crashed zeus instances.
+alias zsw='rm .zeus.sock'
+alias zweep='rm .zeus.sock'