fixed minor doc typos (spaces within words)
add support for a variable "java_keystore"

you can use this variable to manage alternative Java keystores, such
as an in-house JRE package or application-specific keystore files.
Merge pull request #16 from neoice/doc-typos

fixed minor doc typos (spaces within words)
Merge pull request #17 from neoice/java_keystore

add support for a variable "java_keystore"