Fixing improper input syntax and failing bounds check
Use actually valid transactions for script tests
Add actual signature tests
Grammar fixes in README

Github-Pull: #4956
Fixing out of bounds error in GetKey()
Merge pull request #4962

6f3ae9b Fixing out of bounds error in GetKey() (ENikS)
Merge pull request #4949

c8589bf Add actual signature tests (Pieter Wuille)
76ec867 Use actually valid transactions for script tests (Pieter Wuille)
Merge pull request #4955

87314c1 Fixing improper input syntax and failing bounds check (ENikS)
Add automatic script test generation, and actual checksig tests