Fixes and submissions of plants and flowers

reverted tree fern to Gondor biome coloured red flower/grape bush
submitted original texture and psd for Pale Bearded orchid
submitted original texture and psd for heather
submitted original texture and psd for tree fern
submitted original texture for tiger lily
submitted original texture for Athelas
Merge pull request #31 from MattTheLegoman/master

Fixes and submissions of plants and flowers