Added tip3p-fb and tip4p-fb parameter files.

wrappers/python/simtk/openmm/app/data/tip3p-fb.xml

+<ForceField>
+ <Info>
+  <Reference>Lee-Ping Wang, Todd J. Martinez and Vijay S. Pande. Building force fields - an automatic, systematic and reproducible approach.  Journal of Physical Chemistry Letters, ASAP, 2014. DOI: 10.1021/jz500737m.</Reference>
+ </Info>
+ <AtomTypes>
+  <Type name="tip3p-fb-O" class="OW" element="O" mass="15.99943"/>
+  <Type name="tip3p-fb-H" class="HW" element="H" mass="1.007947"/>
+ </AtomTypes>
+ <Residues>
+  <Residue name="HOH">
+   <Atom name="O" type="tip3p-fb-O"/>
+   <Atom name="H1" type="tip3p-fb-H"/>
+   <Atom name="H2" type="tip3p-fb-H"/>
+   <Bond from="0" to="1"/>
+   <Bond from="0" to="2"/>
+  </Residue>
+ </Residues>
+ <HarmonicBondForce>
+  <Bond class1="OW" class2="HW" length="0.101181082494" k="462750.4"/>
+ </HarmonicBondForce>
+ <HarmonicAngleForce>
+  <Angle class1="HW" class2="OW" class3="HW" angle="1.88754640288" k="836.8"/>
+ </HarmonicAngleForce>
+ <NonbondedForce coulomb14scale="0.833333" lj14scale="0.5">
+  <Atom type="tip3p-fb-O" charge="-0.848448690103" sigma="0.317796456355" epsilon="0.652143528104" />
+  <Atom type="tip3p-fb-H" charge="0.4242243450515" sigma="1" epsilon="0" />
+ </NonbondedForce>
+</ForceField>
+

wrappers/python/simtk/openmm/app/data/tip4p-fb.xml

+<ForceField>
+ <Info>
+  <Reference>Lee-Ping Wang, Todd J. Martinez and Vijay S. Pande. Building force fields - an automatic, systematic and reproducible approach.  Journal of Physical Chemistry Letters, ASAP, 2014. DOI: 10.1021/jz500737m.</Reference>
+ </Info>
+ <AtomTypes>
+  <Type name="tip4p-fb-O" class="OW" element="O" mass="15.99943"/>
+  <Type name="tip4p-fb-H" class="HW" element="H" mass="1.007947"/>
+  <Type name="tip4p-fb-M" class="MW" mass="0"/>
+ </AtomTypes>
+ <Residues>
+  <Residue name="HOH">
+   <Atom name="O" type="tip4p-fb-O"/>
+   <Atom name="H1" type="tip4p-fb-H"/>
+   <Atom name="H2" type="tip4p-fb-H"/>
+   <Atom name="M" type="tip4p-fb-M"/>
+   <VirtualSite type="average3" index="3" atom1="0" atom2="1" atom3="2" weight1="8.203146574531e-01" weight2="8.984267127345e-02" weight3="8.984267127345e-02" />
+   <Bond from="0" to="1"/>
+   <Bond from="0" to="2"/>
+  </Residue>
+ </Residues>
+ <HarmonicBondForce>
+  <Bond class1="OW" class2="HW" length="0.09572" k="462750.4"/>
+ </HarmonicBondForce>
+ <HarmonicAngleForce>
+  <Angle class1="HW" class2="OW" class3="HW" angle="1.82421813418" k="836.8"/>
+ </HarmonicAngleForce>
+ <NonbondedForce coulomb14scale="0.833333" lj14scale="0.5">
+  <Atom type="tip4p-fb-O" charge="0" sigma="3.165552430462e-01" epsilon="7.492790213533e-01" />
+  <Atom type="tip4p-fb-H" charge="5.258681106763e-01" sigma="1" epsilon="0" />
+  <Atom type="tip4p-fb-M" charge="-1.0517362213526e+00" sigma="1" epsilon="0" />
+ </NonbondedForce>
+</ForceField>