Update bosh lite pool scripts to work on ZSH (#46)

- Issues:
  - https://unix.stackexchange.com/questions/255480/why-does-behave-differently-inside-in-zsh-and-bash
  - https://superuser.com/questions/555874/zsh-read-command-fails-within-bash-function-read1-p-no-coprocess

lib/claim-bosh-lite.bash

@@ -97,7 +97,7 @@ function claim_bosh_lite() {
 
       file=`find . -name $env`
 
-      if [ "$file" == "" ]; then
+      if [[ "$file" == "" ]]; then
         echo $env does not exist
         return 1
       fi
@@ -212,7 +212,7 @@ EOF
     echo "$PWD/$(basename "${env_file}")"
   )
 
-  if [ "$?" == 0 ]; then
+  if [[ "$?" == 0 ]]; then
     direnv allow "${env_dir}"
     echo "Changing directory to '${env_dir}'..."
     cd "${env_dir}"

lib/unclaim-bosh-lite.bash

@@ -32,12 +32,13 @@ function unclaim_bosh_lite() {
       env=$1
       file="$(find "${working_pool}" -name "${env}")"
 
-      if [ "$file" == "" ]; then
+      if [[ "$file" == "" ]]; then
         echo "$env does not exist in ${working_pool}"
         return 1
       fi
 
-      read -r -p "Hit enter to release ${env} "
+      printf "Hit enter to release ${env} "
+      read -r
 
       git mv "${file}" "${broken_pool}/unclaimed/"
       if [ -d "${env}" ]; then