Minor typo/error fixes (#88)

* Fix typos in BoundingBox doc
* Initialize _maxNumberOfParticles to kMaxSize

Author: doyubkim

include/jet/bounding_box2.h

@@ -95,7 +95,7 @@ class BoundingBox<T, 2> {
     //! Merges this and other point.
     void merge(const Vector2<T>& point);
 
-    //! Merges this and other boxes.
+    //! Merges this and other box.
     void merge(const BoundingBox& other);
 
     //! Expands this box by given delta to all direction.

include/jet/bounding_box3.h

@@ -40,7 +40,7 @@ struct BoundingBoxRayIntersection3 {
 template <typename T>
 class BoundingBox<T, 3> {
  public:
-    //! Upper corner of the bounding box.
+    //! Lower corner of the bounding box.
     Vector3<T> lowerCorner;
 
     //! Upper corner of the bounding box.
@@ -98,7 +98,7 @@ class BoundingBox<T, 3> {
     //! Merges this and other point.
     void merge(const Vector3<T>& point);
 
-    //! Merges this and other boxes.
+    //! Merges this and other box.
     void merge(const BoundingBox& other);
 
     //! Expands this box by given delta to all direction.

include/jet/volume_particle_emitter2.h

@@ -129,7 +129,7 @@ class VolumeParticleEmitter2 final : public ParticleEmitter2 {
     Vector2D _initialVel;
     PointGenerator2Ptr _pointsGen;
 
-    size_t _maxNumberOfParticles;
+    size_t _maxNumberOfParticles = kMaxSize;
     size_t _numberOfEmittedParticles = 0;
 
     double _jitter = 0.0;

include/jet/volume_particle_emitter3.h

@@ -128,7 +128,7 @@ class VolumeParticleEmitter3 final : public ParticleEmitter3 {
     Vector3D _initialVel;
     PointGenerator3Ptr _pointsGen;
 
-    size_t _maxNumberOfParticles = std::numeric_limits<size_t>::max();
+    size_t _maxNumberOfParticles = kMaxSize;
     size_t _numberOfEmittedParticles = 0;
 
     double _jitter = 0.0;