Add ST_CreateGrid function.
The function is based on a new signature and received two first arguments : a table name or a geometry.
Replace st_creategrid by makegrid and improve it
Fetch master
Enable NOCACHE option
Add st_makegridpoints to compute a regular set of points
cleanup
forgot to increment the cell index
Fix test and correct cell indexes
Add new tests and extract the commun GridRowSet.
The grid functions is able to work wih double::double delta X and Y
Add ST_DelaunayTriangles.
Update the pom to use JDelaunay
Update the pom with the last JDelaunay version
Add ST_MakeEllipse

I simplified the signatures allowed in GDMS. Now we have just one
signature:
```mysql
SELECT ST_MakeEllipse(ST_MakePoint(2, -3), 6, 4);
```

In GDMS, the following were available:
```mysql
SELECT ST_MakeEllipse(ST_MakePoint(2, -3), 6, 4);
SELECT ST_MakeEllipse(2, -3, 6, 4);
SELECT ST_MakeEllipse(2, -3, 6, 4, PI()/3);
```

The rotation part can be taken care of by ST_Rotate.
Compare ST_Buffer to ST_MakeEllipse for circles.

The only difference between a circle constructed using `ST_MakeEllipse`
and a circle contructed using `ST_Buffer` is the number of line segments
in the approximation.  `ST_MakeEllipse` is more fine-grained (100
segments rather than 32).
Merge pull request #72 from agouge/st_makeellipse

Merge Just one signature is available:
```mysql
SELECT ST_MakeEllipse(ST_MakePoint(2, -3), 6, 4);
```
This creates an ellipse centered at `POINT(2 3)` with width 6 and height 4.

The only difference between a circle constructed using `ST_MakeEllipse`
and a circle contructed using `ST_Buffer` is the number of line segments
in the approximation.  `ST_MakeEllipse` is more fine-grained (100
segments rather than 32).

*Note*: In GDMS, the following signatures were available:
```mysql
SELECT ST_MakeEllipse(ST_MakePoint(2, -3), 6, 4);
SELECT ST_MakeEllipse(2, -3, 6, 4);
SELECT ST_MakeEllipse(2, -3, 6, 4, PI()/3);
```
The rotation part can be taken care of by `ST_Rotate`.
Add two new functions to create delaunay and constrained delaunay triangulation.
Merge with master
Fix import
Add a new test with delatX!=deltaY
Update master
Fix import