Adding generated files for release

Adding generated files for release

Removing accidentally included binary: scanner.lex.o

Fix build error on newer gcc

Summary:
Our ancient copy of gcc lets this through but older versions do not.

Reviewed By: epriestley

Test Plan: build

Fix bug with duped __xhpAttributeDeclaration

Summary:
Currently XHP will define __xhpAttributeDeclaration on any class that uses the
leading-colon scheme. This is annoying because we can't define a base
implementation or __xhpAttributeDeclaration. So now it only defines
__xhpAttributeDeclaration if you define attributes.

Reviewed By: epriestley

Test Plan: xhpize

Revert: OK

Bump version number to 1.3.4

Summary:
Hurf

Default idx_expr to true in xhp_preprocess

Summary:
Clients using the old non-flags version of xhp_preprocess should get the
idx_expr rule by default. This does not include the PHP extension, there's
an ini option for that.

Reviewed By: dweatherford

Test Plan: xhpize

Revert: OK

Bump version to 1.3.1

Bump to 1.3.1

Last commit added a function so I need to bump the version number

Prefer flex35 over flex

Summary:
On some machines we have old versions of flex as the default for building PHP,
but XHP requires a newer version. While building XHP now prefer `flex35` over
`flex`.

Reviewed By: shire

Test Plan: make xhpize

Revert: OK