Update VariableSubstitutionHelper.java

Added one line for StudySubjectOID
Update README.md
Merge branch 'master' of https://github.com/OpenClinica/OpenClinica
Merge branch 'master' of https://github.com/OpenClinica/OpenClinica
OC-5893 Token for StudySubjectOID
OC-5911
Display a message to the user if OpenClinica is accessed from a
non-supported browser or browser version 
This is the implementation for this story,
Merge branch 'master' of https://github.com/OpenClinica/OpenClinica
OC-5928: REST URL to use studySubjectID to get clinical data

Added code to handle a SSID as well as a SSOID in the REST calls.
OC-5928: REST URL to use studySubjectID to get clinical data

Added missing update to security XML file and modified code to return
null if lookups fail (rather than throw an Exception right away)
OC-5928: REST URL to use studySubjectID to get clinical data

Fixed code so wildcard URL arguments (*) will still work.
OC-5917
Update CRF Template to include corrections and additional guidance to
the Instructions worksheet 
uploaded crf template version 3.4
OC-5937
Update property file to be blank for PForm URL value
OC-2805
Cannot insert a value using rule into a PDATE field from another PDATE
field
This push includes 
1. fix for PDate field in value Expression
2. Validation check on Date types
3. Unit Testing
OC-2805
Type fix
Merge pull request #54 from rooney/OC-5893

OC-5893 Token for StudySubjectOID
OC-5893: Token for StudySubjectOID
Merge pull request #64 from kkrumlian/master

OC-5893: Token for StudySubjectOID
Merge pull request #59 from jkeremian/OC-5917

OC-5917 Update CRF Template to include corrections and additional guidance to the Instructions worksheet
Merge pull request #55 from jkeremian/OC-5911

OC-5911 Display a message to the user if OpenClinica is accessed from a non-supported browser or browser version
Merge pull request #60 from jkeremian/OC-5937

OC-5937 Update property file to be blank for PForm URL value