merge georgewfraser: Quote table and column names that contain special characters

Merge pull request #135 from fivetran/sql-parser/unparser-quote-identifiers
https://github.com/FoundationDB/sql-parser/pull/135
merge fivetran: Underscore is permitted as first character of an identifier

Merge pull request #133 from fivetran/sql-parser/master
https://github.com/FoundationDB/sql-parser/pull/133
Release 1.4.0
Bump version to 1.5.0
updated readme parser
merge nathanlws: Bump version 1.5.0

Merge pull request #140 from FoundationDB/sql-parser/bump-version-1.5.0
https://github.com/FoundationDB/sql-parser/pull/140
updated on comments
merge SytzeH: Update README local install section

Merge pull request #139 from SytzeH/sql-parser/readme
https://github.com/FoundationDB/sql-parser/pull/139
Names which include capital letters need to be quoted for Postgres