New Ring opening/closing reaction classes

These new reaction families are added for primary ring opening reactions:
1- Intra_RH_Add_Exocyclic: Ring opening through tautomerization (H-migration and double bond formation)
![image](https://cloud.githubusercontent.com/assets/1557993/3274397/a0b2902e-f32e-11e3-9e3d-f48b52511a99.png)
2- Intra_RH_Add_Endocyclic: Ring opening through tautomerization (H-migration and double bond formation)
![image](https://cloud.githubusercontent.com/assets/1557993/3274407/b4eb6e9e-f32e-11e3-8ac8-87eb8080977b.png)
3- Intra_R_Add_ExoTetCyclic: Baldwin's exo-tet ring opening reaction class
![image](https://cloud.githubusercontent.com/assets/1557993/3274412/bc198a7a-f32e-11e3-84a5-e91c7fe80dec.png)

Still kinetic data is needed to fill the database for new families.